Redmine

03/24/2026

CP 01:03 PM ATM environment alarm system atm-environment-alarm-system #30 (New): SPS30 housing and grounding

Interface Selection:
Ensure the metal shielding is kept electrically floating to avoid unintended currents that could damage the sensor or cause overheating Carsten Poulsen

CP 01:02 PM ATM environment alarm system atm-environment-alarm-system #29: SPS30 Maintenance (for the Manual)

The SPS30 will be permanently powered, so it should automatically clean once a week. Carsten Poulsen

CP 01:01 PM ATM environment alarm system atm-environment-alarm-system #29 (New): SPS30 Maintenance (for the Manual)

# Maintenance
The SPS30 is designed to be maintenance-free due to its "sheath air" technology, which protects the optical components from fouling.
## Automatic Fan Cleaning:
* The sensor features an internal cleaning routine that spi... Carsten Poulsen

CP 12:59 PM ATM environment alarm system atm-environment-alarm-system #28 (New): SPS30 positioning

# Mounting & Positioning
Proper orientation is critical to prevent dust from settling in the optical chamber or recirculating within the sensor.
## Preferred Orientations:
* Vertical: Position the sensor with the inlets and outlet fa... Carsten Poulsen

03/23/2026

CP 06:45 PM ATM environment alarm system atm-environment-alarm-system #27 (New): GPIO Allocation

Note: ALL PINS can be rearranged.
The current reflects so only the test system.
| Type | GPIO | Descr | | remark |
|---------|------|-------------------------------------|---|----------|
| Outpu... Carsten Poulsen

03/20/2026

CP 08:54 AM ATM environment alarm system atm-environment-alarm-system #26 (New): ESP32 Drive Ouput max 20mA

This design constrain is to limit ESP32 output current to 20mA.
If required, it can be increased to 40mA. Carsten Poulsen

03/19/2026

CP 08:59 PM ATM environment alarm system atm-environment-alarm-system #25 (New): Particle sensor system does not start when no WiFi

Carsten Poulsen

03/18/2026

CP 08:11 PM ATM environment alarm system atm-environment-alarm-system #24 (New): Provisioning reset

``` c
#define WIFI_RESET_GPIO GPIO_NUM_0 // or whatever GPIO you choose
// Check at boot — hold button during power-on to reset WiFi
gpio_config_t cfg = {
.pin_bit_mask = (1ULL << WIFI_RESET_GPIO),
.mode = GP... Carsten Poulsen

CP 05:33 PM ATM environment alarm system atm-environment-alarm-system #23 (New): Filter test in config fails

The issue is that filter output is controlled in a separate task Carsten Poulsen

CP 09:31 AM ATM environment alarm system atm-environment-alarm-system #22 (New): Filter afterrun

Afterrun time shall be configurable in 1-100 minutes.
When going below warning or when activated by a push button, the filter shall (still) be on for the afterrun time.
The reset button will stop the filter if in normal.
The reset but... Carsten Poulsen