veles_labs/iaq_sensor_wired
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Linear change of LED color according to CO2 level

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mj 2021-11-18 19:56:23 +01:00
parent c2a67d173d
commit bb274d367a
1 changed files with 34 additions and 11 deletions
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27
fw/Core/Src/main.c
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@ -124,6 +124,7 @@ static void MX_TIM2_Init(void);
static void MX_TIM22_Init(void);
/* USER CODE BEGIN PFP */
void USART2_TX_Buffer(uint8_t* buffer_tx, uint16_t buffer_tx_len);
void CO2_to_color(uint16_t co2, uint16_t co2_limit_yellow, uint16_t co2_limit_red);
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
@ -306,7 +307,6 @@ int main(void)
new_baud = LL_USART_GetBaudRate(USART2, SYSTICK_FREQ_HZ, LL_USART_OVERSAMPLING_16);
}
/* It is time for measurement */
if (tim21_elapsed_period == 1)
{
@ -339,8 +339,9 @@ int main(void)
tim21_elapsed_period = 0;
}
/* TEST END */
if (sensor_config.led_on) {
if (sensor_config.led_on == 1) {
if (co2_valid == 1) {
if (sensor_config.led_smooth == 0) {
if (CO2 <= sensor_config.led_co2_alert_limit1) {
/* CO2 is OK -> GREEN */
rgbled_set_color(RGBLED_GREEN);
@ -354,6 +355,10 @@ int main(void)
/* CO2 is CRITICAL -> RED */
rgbled_set_color(RGBLED_RED);
}
} else {
/* */
CO2_to_color(CO2, sensor_config.led_co2_alert_limit1, sensor_config.led_co2_alert_limit2);
}
} else {
/* CO2 invalid */
rgbled_set_color(RGBLED_MAGENTA);
@ -892,6 +897,24 @@ int8_t modbus_transmit_function(uint8_t *buffer, uint16_t data_len)
USART2_TX_Buffer(buffer, data_len);
return MODBUS_OK;
}
void CO2_to_color(uint16_t co2, uint16_t co2_limit_yellow, uint16_t co2_limit_red)
{
const uint16_t co2_limit_green = 400; /* fresh air, lowest possible value */
uint32_t co2_full_span;
uint32_t intensity;
if (co2 < co2_limit_green) {
rgbled_set_color(RGBLED_GREEN);
} else if (co2 > co2_limit_red) {
rgbled_set_color(RGBLED_RED);
} else {
co2_full_span = co2_limit_red - co2_limit_green;
intensity = (co2 - co2_limit_green) * 255 / co2_full_span;
rgbled_set_color(intensity, 255 - intensity, 0);
}
}
/* USER CODE END 4 */
/**