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homeassistant-config/esphome/owon_b35t.h
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/*
* ESPHome helper for OWON B35T/B35T+ BLE meter on M5Stack Core 1.
* Parser is based on the standalone Arduino sketch by Reaper7
* (Beerware license, Revision 42) and Dean Cording's owonb35 notes.
*/
#pragma once
#include <cmath>
#include <cstdint>
#include <cstring>
#include <string>
#include <vector>
#include "esp_heap_caps.h"
#include "esp_system.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
#include "esphome/components/display/display.h"
namespace owon_b35t {
using esphome::Color;
using esphome::display::Display;
static const char *const TAG = "owon_b35t";
static const uint8_t DIODE_BMP[32] = {
0b00001000, 0b00011000,
0b00001100, 0b00011000,
0b00001110, 0b00011000,
0b00001111, 0b00011000,
0b00001111, 0b10011000,
0b00001111, 0b11011000,
0b00001111, 0b11111000,
0b11111111, 0b11111111,
0b11111111, 0b11111111,
0b00001111, 0b11111000,
0b00001111, 0b11011000,
0b00001111, 0b10011000,
0b00001111, 0b00011000,
0b00001110, 0b00011000,
0b00001100, 0b00011000,
0b00001000, 0b00011000,
};
static const uint8_t BUZZ_BMP[32] = {
0b00000000, 0b11000000,
0b00000001, 0b11000000,
0b00000011, 0b11000001,
0b00000111, 0b11000001,
0b00001111, 0b11000101,
0b11111111, 0b11000101,
0b11111111, 0b11010101,
0b11111111, 0b11010101,
0b11111111, 0b11010101,
0b11111111, 0b11010101,
0b11111111, 0b11000101,
0b00001111, 0b11000101,
0b00000111, 0b11000001,
0b00000011, 0b11000001,
0b00000001, 0b11000000,
0b00000000, 0b11000000,
};
class Meter {
public:
static constexpr uint8_t REGPLUSMINUS = 0x00;
static constexpr uint8_t FLAGPLUS = 0b00101011;
static constexpr uint8_t FLAGMINUS = 0b00101101;
static constexpr uint8_t REGDIG1 = 0x01;
static constexpr uint8_t REGDIG2 = 0x02;
static constexpr uint8_t REGDIG3 = 0x03;
static constexpr uint8_t REGDIG4 = 0x04;
static constexpr uint8_t REGPOINT = 0x06;
static constexpr uint8_t FLAGPOINT0 = 0b00110000;
static constexpr uint8_t FLAGPOINT1 = 0b00110001;
static constexpr uint8_t FLAGPOINT2 = 0b00110010;
static constexpr uint8_t FLAGPOINT3 = 0b00110100;
static constexpr uint8_t REGMODE = 0x07;
static constexpr uint8_t FLAGMODEHOLD = 0b00000010;
static constexpr uint8_t FLAGMODEREL = 0b00000100;
static constexpr uint8_t FLAGMODEAC = 0b00001000;
static constexpr uint8_t FLAGMODEDC = 0b00010000;
static constexpr uint8_t FLAGMODEAUTO = 0b00100000;
static constexpr uint8_t REGMINMAX = 0x08;
static constexpr uint8_t FLAGMIN = 0b00010000;
static constexpr uint8_t FLAGMAX = 0b00100000;
static constexpr uint8_t REGSCALE = 0x09;
static constexpr uint8_t FLAGSCALEDUTY = 0b00000010;
static constexpr uint8_t FLAGSCALEDIODE = 0b00000100;
static constexpr uint8_t FLAGSCALEBUZZ = 0b00001000;
static constexpr uint8_t FLAGSCALEMEGA = 0b00010000;
static constexpr uint8_t FLAGSCALEKILO = 0b00100000;
static constexpr uint8_t FLAGSCALEMILLI = 0b01000000;
static constexpr uint8_t FLAGSCALEMICRO = 0b10000000;
static constexpr uint8_t REGUNIT = 0x0a;
static constexpr uint8_t FLAGUNITFAHR = 0b00000001;
static constexpr uint8_t FLAGUNITGRAD = 0b00000010;
static constexpr uint8_t FLAGUNITNF = 0b00000100;
static constexpr uint8_t FLAGUNITHZ = 0b00001000;
static constexpr uint8_t FLAGUNITHFE = 0b00010000;
static constexpr uint8_t FLAGUNITOHM = 0b00100000;
static constexpr uint8_t FLAGUNITAMP = 0b01000000;
static constexpr uint8_t FLAGUNITVOLT = 0b10000000;
bool connected{false};
bool write_available{false};
bool is_plus{false};
bool low_battery{false};
bool overload{false};
bool has_reading{false};
uint8_t selected_button{1};
uint32_t last_notify_ms{0};
bool handle_notify(const std::vector<uint8_t> &data) {
if (data.size() > sizeof(this->raw_))
return false;
if (data.size() == 6 && data[1] >= 0xF0) {
memset(this->raw_, 0, sizeof(this->raw_));
memcpy(this->raw_, data.data(), data.size());
this->is_plus = true;
this->parse_plus_();
} else if (data.size() == 14 && data[12] == 0x0D && data[13] == 0x0A) {
memset(this->value_, 0, sizeof(this->value_));
memcpy(this->value_, data.data(), data.size());
this->is_plus = false;
} else {
ESP_LOGW(TAG, "Ignoring unexpected OWON frame length=%u", static_cast<unsigned>(data.size()));
return false;
}
this->overload = memcmp(this->value_, OVERLOAD_FRAME, sizeof(OVERLOAD_FRAME)) == 0;
this->display_value = this->calc_display_value_();
this->base_value = this->calc_base_value_();
this->has_reading = true;
this->last_notify_ms = millis();
return true;
}
void on_connect() {
this->connected = true;
this->write_available = true;
}
void on_disconnect() {
this->connected = false;
this->write_available = false;
}
float value() const { return this->display_value; }
float value_base() const { return this->base_value; }
bool negative() const { return (this->value_[REGPLUSMINUS] & FLAGMINUS) == FLAGMINUS; }
bool auto_range() const { return (this->value_[REGMODE] & FLAGMODEAUTO) == FLAGMODEAUTO; }
bool hold() const { return (this->value_[REGMODE] & FLAGMODEHOLD) == FLAGMODEHOLD; }
bool relative() const { return (this->value_[REGMODE] & FLAGMODEREL) == FLAGMODEREL; }
bool ac() const { return (this->value_[REGMODE] & FLAGMODEAC) == FLAGMODEAC; }
bool dc() const { return (this->value_[REGMODE] & FLAGMODEDC) == FLAGMODEDC; }
bool min_mode() const { return (this->value_[REGMINMAX] & FLAGMIN) == FLAGMIN; }
bool max_mode() const { return (this->value_[REGMINMAX] & FLAGMAX) == FLAGMAX; }
bool diode() const { return (this->value_[REGSCALE] & FLAGSCALEDIODE) == FLAGSCALEDIODE; }
bool continuity() const { return (this->value_[REGSCALE] & FLAGSCALEBUZZ) == FLAGSCALEBUZZ; }
const char *unit() const {
switch (this->value_[REGUNIT]) {
case FLAGUNITFAHR: return "°F";
case FLAGUNITGRAD: return "°C";
case FLAGUNITNF: return "nF";
case FLAGUNITHZ: return "Hz";
case FLAGUNITHFE: return "hFE";
case FLAGUNITOHM: return "Ω";
case FLAGUNITAMP: return "A";
case FLAGUNITVOLT: return "V";
default: return "";
}
}
const char *scale() const {
if ((this->value_[REGSCALE] & FLAGSCALEDUTY) == FLAGSCALEDUTY) return "%";
if ((this->value_[REGSCALE] & FLAGSCALEMEGA) == FLAGSCALEMEGA) return "M";
if ((this->value_[REGSCALE] & FLAGSCALEKILO) == FLAGSCALEKILO) return "k";
if ((this->value_[REGSCALE] & FLAGSCALEMILLI) == FLAGSCALEMILLI) return "m";
if ((this->value_[REGSCALE] & FLAGSCALEMICRO) == FLAGSCALEMICRO) return "µ";
return "";
}
std::string mode_text() const {
std::string out;
if (this->dc()) out += "DC ";
if (this->ac()) out += "AC ";
if (this->auto_range()) out += "AUTO ";
if (this->hold()) out += "HOLD ";
if (this->relative()) out += "REL ";
if (this->min_mode()) out += "MIN ";
if (this->max_mode()) out += "MAX ";
if (this->diode()) out += "DIODE ";
if (this->continuity()) out += "CONT ";
if (!out.empty()) out.pop_back();
return out;
}
std::string reading_text() const {
if (!this->connected) return "Disconnected";
if (!this->has_reading) return "Waiting for data";
if (this->overload) return "OL " + std::string(this->scale()) + this->unit();
char buf[48];
snprintf(buf, sizeof(buf), "%s%.4g %s%s", this->negative() ? "-" : "", std::fabs(this->display_value), this->scale(), this->unit());
std::string out(buf);
auto mode = this->mode_text();
if (!mode.empty()) out += " " + mode;
return out;
}
enum Kind { KIND_OTHER, KIND_VOLTAGE, KIND_CURRENT, KIND_RESISTANCE, KIND_FREQUENCY, KIND_CAPACITANCE, KIND_TEMP_C, KIND_TEMP_F, KIND_DUTY };
Kind kind() const {
if ((this->value_[REGSCALE] & FLAGSCALEDUTY) == FLAGSCALEDUTY) return KIND_DUTY;
switch (this->value_[REGUNIT]) {
case FLAGUNITVOLT: return KIND_VOLTAGE;
case FLAGUNITAMP: return KIND_CURRENT;
case FLAGUNITOHM: return KIND_RESISTANCE;
case FLAGUNITHZ: return KIND_FREQUENCY;
case FLAGUNITNF: return KIND_CAPACITANCE;
case FLAGUNITGRAD: return KIND_TEMP_C;
case FLAGUNITFAHR: return KIND_TEMP_F;
default: return KIND_OTHER;
}
}
const char *selected_button_name() const {
static const char *const names[] = {"SELECT", "RANGE", "HLD/LIG", "REL/BT", "HZ/DUTY", "MAX/MIN"};
uint8_t index = this->selected_button;
if (index < 1) index = 1;
if (index > 6) index = 6;
return names[index - 1];
}
void previous_button() {
if (this->selected_button > 1) this->selected_button--;
}
void next_button() {
if (this->selected_button < 6) this->selected_button++;
}
void render(Display &it, esphome::display::BaseFont *font) {
const Color bg(0, 0, 0);
const Color fg(210, 210, 210);
// Chosen to map to a neutral dark gray in the RGB332 8-bit display palette.
const Color inactive(80, 80, 80);
const Color yellow(255, 220, 0);
const Color blue(0, 80, 255);
const Color cyan(0, 255, 255);
const Color magenta(255, 0, 255);
const Color red(255, 0, 0);
const Color green(0, 220, 0);
const Color orange(255, 165, 0);
it.fill(bg);
this->label_(it, font, 12, 8, "BAT", this->low_battery ? red : green);
this->label_(it, font, 46, 8, "BLE", this->connected ? blue : inactive);
this->label_(it, font, 86, 8, "AUTO", this->auto_range() ? fg : inactive);
this->label_(it, font, 138, 8, "MAX", this->max_mode() ? red : inactive);
this->label_(it, font, 178, 8, "MIN", this->min_mode() ? green : inactive);
this->label_(it, font, 218, 8, "HOLD", this->hold() ? blue : inactive);
this->label_(it, font, 270, 8, "REL", this->relative() ? Color(128, 128, 0) : inactive);
this->label_(it, font, 8, 66, "DC", this->dc() ? cyan : inactive);
this->label_(it, font, 8, 102, "AC", this->ac() ? magenta : inactive);
if (!this->connected) {
this->draw_digits_(it, "----", false, inactive);
it.print(160, 148, font, inactive, esphome::display::TextAlign::CENTER, "scan/connect");
} else if (!this->has_reading) {
this->draw_digits_(it, "8888", false, inactive);
it.print(160, 148, font, inactive, esphome::display::TextAlign::CENTER, "waiting");
} else if (this->overload) {
this->draw_digits_(it, " OL ", false, fg);
} else {
char d[5];
d[0] = this->digit_char_(REGDIG1);
d[1] = this->digit_char_(REGDIG2);
d[2] = this->digit_char_(REGDIG3);
d[3] = this->digit_char_(REGDIG4);
d[4] = 0;
this->draw_digits_(it, d, this->negative(), fg);
this->draw_decimal_points_(it, fg);
}
std::string unit_line = std::string(this->scale()) + this->unit();
it.print(270, 140, font, yellow, esphome::display::TextAlign::CENTER, unit_line.c_str());
this->draw_bargraph_(it, this->has_reading && !this->overload ? this->digits_from_buffer_() : 0, this->has_reading && !this->overload);
this->draw_icon_(it, 300, 148, 16, 16, DIODE_BMP, this->diode() ? magenta : inactive);
this->draw_icon_(it, 300, 174, 16, 16, BUZZ_BMP, this->continuity() ? orange : inactive);
it.filled_rectangle(34, 212, 40, 24, this->write_available ? fg : inactive);
it.filled_rectangle(108, 212, 100, 24, this->write_available ? fg : inactive);
it.filled_rectangle(242, 212, 40, 24, this->write_available ? fg : inactive);
it.print(54, 216, font, bg, esphome::display::TextAlign::TOP_CENTER, "<");
it.print(158, 216, font, bg, esphome::display::TextAlign::TOP_CENTER, this->selected_button_name());
it.print(262, 216, font, bg, esphome::display::TextAlign::TOP_CENTER, ">");
}
private:
uint8_t raw_[14]{};
uint8_t value_[14]{};
float display_value{NAN};
float base_value{NAN};
static constexpr uint8_t OVERLOAD_FRAME[5] = {0x2B, 0x3F, 0x30, 0x3A, 0x3F};
uint16_t digits_from_buffer_() const {
uint16_t out = 0;
if (this->value_[REGDIG1] >= '0' && this->value_[REGDIG1] <= '9') out += (this->value_[REGDIG1] - '0') * 1000;
if (this->value_[REGDIG2] >= '0' && this->value_[REGDIG2] <= '9') out += (this->value_[REGDIG2] - '0') * 100;
if (this->value_[REGDIG3] >= '0' && this->value_[REGDIG3] <= '9') out += (this->value_[REGDIG3] - '0') * 10;
if (this->value_[REGDIG4] >= '0' && this->value_[REGDIG4] <= '9') out += (this->value_[REGDIG4] - '0');
return out;
}
float calc_display_value_() const {
if (this->overload) return NAN;
if (this->is_plus) {
uint16_t pair1 = static_cast<uint16_t>(this->raw_[0]) | (static_cast<uint16_t>(this->raw_[1]) << 8);
uint8_t decimal = pair1 & 0x07;
if (decimal >= 7) return NAN;
uint16_t pair3 = static_cast<uint16_t>(this->raw_[4]) | (static_cast<uint16_t>(this->raw_[5]) << 8);
bool negative = pair3 >= 0x7FFF;
uint16_t digits = negative ? (pair3 & 0x7FFF) : pair3;
float v = static_cast<float>(digits) / std::pow(10.0f, decimal);
return negative ? -v : v;
}
uint8_t decimal = 0;
switch (this->value_[REGPOINT] & 0x07) {
case 0b001: decimal = 1; break;
case 0b010: decimal = 2; break;
case 0b100: decimal = 3; break;
default: break;
}
float v = static_cast<float>(this->digits_from_buffer_()) / std::pow(10.0f, decimal);
return this->negative() ? -v : v;
}
float calc_base_value_() const {
if (std::isnan(this->display_value)) return NAN;
if (this->value_[REGUNIT] == FLAGUNITNF) return this->display_value * 1e-9f;
if ((this->value_[REGSCALE] & FLAGSCALEMEGA) == FLAGSCALEMEGA) return this->display_value * 1e6f;
if ((this->value_[REGSCALE] & FLAGSCALEKILO) == FLAGSCALEKILO) return this->display_value * 1e3f;
if ((this->value_[REGSCALE] & FLAGSCALEMILLI) == FLAGSCALEMILLI) return this->display_value * 1e-3f;
if ((this->value_[REGSCALE] & FLAGSCALEMICRO) == FLAGSCALEMICRO) return this->display_value * 1e-6f;
return this->display_value;
}
void parse_plus_() {
memset(this->value_, 0, sizeof(this->value_));
this->value_[5] = 0x20;
this->value_[12] = 0x0D;
this->value_[13] = 0x0A;
uint16_t pair1 = static_cast<uint16_t>(this->raw_[0]) | (static_cast<uint16_t>(this->raw_[1]) << 8);
uint8_t function = (pair1 >> 6) & 0x0F;
uint8_t scale = (pair1 >> 3) & 0x07;
uint8_t decimal = pair1 & 0x07;
switch (decimal) {
case 0: this->value_[REGPOINT] = FLAGPOINT0; break;
case 1: this->value_[REGPOINT] = FLAGPOINT3; break;
case 2: this->value_[REGPOINT] = FLAGPOINT2; break;
case 3: this->value_[REGPOINT] = FLAGPOINT1; break;
default: break;
}
switch (function) {
case 0: this->value_[REGUNIT] |= FLAGUNITVOLT; this->value_[REGMODE] |= FLAGMODEDC; break;
case 1: this->value_[REGUNIT] |= FLAGUNITVOLT; this->value_[REGMODE] |= FLAGMODEAC; break;
case 2: this->value_[REGUNIT] |= FLAGUNITAMP; this->value_[REGMODE] |= FLAGMODEDC; break;
case 3: this->value_[REGUNIT] |= FLAGUNITAMP; this->value_[REGMODE] |= FLAGMODEAC; break;
case 4: this->value_[REGUNIT] |= FLAGUNITOHM; break;
case 5: this->value_[REGUNIT] |= FLAGUNITNF; break;
case 6: this->value_[REGUNIT] |= FLAGUNITHZ; break;
case 7: this->value_[REGSCALE] |= FLAGSCALEDUTY; break;
case 8: this->value_[REGUNIT] |= FLAGUNITGRAD; break;
case 9: this->value_[REGUNIT] |= FLAGUNITFAHR; break;
case 10: this->value_[REGSCALE] |= FLAGSCALEDIODE; break;
case 11: this->value_[REGSCALE] |= FLAGSCALEBUZZ; break;
case 12: this->value_[REGUNIT] |= FLAGUNITHFE; break;
default: break;
}
switch (scale) {
case 2: this->value_[REGSCALE] |= FLAGSCALEMICRO; break;
case 3: this->value_[REGSCALE] |= FLAGSCALEMILLI; break;
case 5: this->value_[REGSCALE] |= FLAGSCALEKILO; break;
case 6: this->value_[REGSCALE] |= FLAGSCALEMEGA; break;
default: break;
}
uint16_t pair2 = static_cast<uint16_t>(this->raw_[2]) | (static_cast<uint16_t>(this->raw_[3]) << 8);
if (pair2 & (1 << 0)) this->value_[REGMODE] |= FLAGMODEHOLD;
if (pair2 & (1 << 1)) this->value_[REGMODE] |= FLAGMODEREL;
if (pair2 & (1 << 2)) this->value_[REGMODE] |= FLAGMODEAUTO;
this->low_battery = (pair2 & (1 << 3)) != 0;
if (pair2 & (1 << 4)) this->value_[REGMINMAX] |= FLAGMIN;
if (pair2 & (1 << 5)) this->value_[REGMINMAX] |= FLAGMAX;
uint16_t pair3 = static_cast<uint16_t>(this->raw_[4]) | (static_cast<uint16_t>(this->raw_[5]) << 8);
if (decimal < 7) {
uint16_t digits = pair3;
if (pair3 < 0x7FFF) {
this->value_[REGPLUSMINUS] = FLAGPLUS;
} else {
this->value_[REGPLUSMINUS] = FLAGMINUS;
digits = pair3 & 0x7FFF;
}
this->value_[REGDIG1] = '0' + ((digits / 1000) % 10);
this->value_[REGDIG2] = '0' + ((digits / 100) % 10);
this->value_[REGDIG3] = '0' + ((digits / 10) % 10);
this->value_[REGDIG4] = '0' + (digits % 10);
} else {
memcpy(this->value_, OVERLOAD_FRAME, sizeof(OVERLOAD_FRAME));
}
}
char digit_char_(uint8_t reg) const {
uint8_t c = this->value_[reg];
return (c >= '0' && c <= '9') ? static_cast<char>(c) : ' ';
}
void label_(Display &it, esphome::display::BaseFont *font, int x, int y, const char *text, Color color) {
it.print(x, y, font, color, esphome::display::TextAlign::TOP_LEFT, text);
}
void draw_digits_(Display &it, const char *text, bool negative, Color color) {
if (negative) this->draw_segment_(it, 8, 88, 26, 9, true, color);
constexpr int digit_x = 40;
constexpr int digit_y = 35;
constexpr int digit_w = 50;
constexpr int digit_h = 88;
constexpr int digit_distance = 64;
for (int i = 0; i < 4; i++) {
this->draw_seven_segment_(it, digit_x + i * digit_distance, digit_y, digit_w, digit_h, text[i], color);
}
}
void draw_decimal_points_(Display &it, Color color) {
uint8_t p = this->value_[REGPOINT];
if ((p & FLAGPOINT1) == FLAGPOINT1) it.filled_rectangle(95, 117, 8, 10, color);
if ((p & FLAGPOINT2) == FLAGPOINT2) it.filled_rectangle(159, 117, 8, 10, color);
if ((p & FLAGPOINT3) == FLAGPOINT3) it.filled_rectangle(223, 117, 8, 10, color);
}
void draw_segment_(Display &it, int x, int y, int w, int h, bool horizontal, Color color) {
if (horizontal) {
int cap = h / 2;
it.filled_rectangle(x + cap, y, w - 2 * cap, h, color);
it.filled_triangle(x, y + cap, x + cap, y, x + cap, y + h, color);
it.filled_triangle(x + w, y + cap, x + w - cap, y, x + w - cap, y + h, color);
} else {
int cap = w / 2;
it.filled_rectangle(x, y + cap, w, h - 2 * cap, color);
it.filled_triangle(x + cap, y, x, y + cap, x + w, y + cap, color);
it.filled_triangle(x + cap, y + h, x, y + h - cap, x + w, y + h - cap, color);
}
}
void draw_icon_(Display &it, int x, int y, int w, int h, const uint8_t *data, Color color) {
for (int row = 0; row < h; row++) {
for (int col = 0; col < w; col++) {
uint8_t byte = data[row * ((w + 7) / 8) + (col / 8)];
if ((byte & (0x80 >> (col % 8))) != 0) {
it.draw_pixel_at(x + col, y + row, color);
}
}
}
}
void draw_seven_segment_(Display &it, int x, int y, int w, int h, char ch, Color color) {
bool a=false,b=false,c=false,d=false,e=false,f=false,g=false;
switch (ch) {
case '0': a=b=c=d=e=f=true; break;
case '1': b=c=true; break;
case '2': a=b=d=e=g=true; break;
case '3': a=b=c=d=g=true; break;
case '4': b=c=f=g=true; break;
case '5': a=c=d=f=g=true; break;
case '6': a=c=d=e=f=g=true; break;
case '7': a=b=c=true; break;
case '8': a=b=c=d=e=f=g=true; break;
case '9': a=b=c=d=f=g=true; break;
case 'O': a=b=c=d=e=f=true; break;
case 'L': d=e=f=true; break;
case '-': g=true; break;
default: break;
}
int t = 10;
int half = h / 2;
int gap = 1;
int top_y = y;
int mid_y = y + half - t / 2;
int bot_y = y + h - t;
int upper_v_y = top_y + t + gap;
int upper_v_h = mid_y - gap - upper_v_y;
int lower_v_y = mid_y + t + gap;
int lower_v_h = bot_y - gap - lower_v_y;
if (a) this->draw_segment_(it, x + t / 2, top_y, w - t, t, true, color);
if (b && upper_v_h > 0) this->draw_segment_(it, x + w - t, upper_v_y, t, upper_v_h, false, color);
if (c && lower_v_h > 0) this->draw_segment_(it, x + w - t, lower_v_y, t, lower_v_h, false, color);
if (d) this->draw_segment_(it, x + t / 2, bot_y, w - t, t, true, color);
if (e && lower_v_h > 0) this->draw_segment_(it, x, lower_v_y, t, lower_v_h, false, color);
if (f && upper_v_h > 0) this->draw_segment_(it, x, upper_v_y, t, upper_v_h, false, color);
if (g) this->draw_segment_(it, x + t / 2, mid_y, w - t, t, true, color);
}
void draw_bargraph_(Display &it, uint16_t digits, bool active) {
const Color fg(255, 255, 255);
const Color inactive(80, 80, 80);
uint16_t mapped = active ? static_cast<uint16_t>(digits * 240 / 6000) : 0;
if (mapped > 240) mapped = 240;
for (uint16_t i = 0; i <= 240; i += 4) {
Color col = (active && i <= mapped) ? fg : inactive;
int h = (i % 40 == 0) ? 20 : ((i % 20 == 0) ? 15 : 10);
it.vertical_line(40 + i, 185 - h, h, col);
}
it.horizontal_line(35, 185, 250, inactive);
}
};
} // namespace owon_b35t
static owon_b35t::Meter owon_meter;
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