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Dobrica Pavlinušić's random unstructured stuff
DSM501A: Revision 12
{file: dsm501.pdf}
{file: EF10016-DSM501[1].pdf} DMS501A - 2mm pin pitch, DMS501B - 2.54 mm 5V, 90mA 1 minute stabilization after power up sum time of low (0.7v) for measurement interval, divide by time ^ PINOUT I/O DESCRIPTION | Pin number | Pin name | Description | | #1 | Control | Vout 1 control | | #2 | Vout 2 | Vout 2 output factory calibrated PWM output for density of particles over 1 �m. | | #3 | Vcc | Positive power supply DC 5V | | #4 | Vout 1 | Vout 1 output (PWM) | | #5 | GND | Ground | {image: dms501-5pins.png} ^^ control pin 1 resistor between pin 1 and ground (square pin on board) to control vout 1 output (pin 4) | Resistor value | Description | | open | Preset sensitivity (over 2.5 �m) | | 47K | Half sensitivity (over 1.75 �m) | | 18.2K | Equal sensitivity of Vout 2 (over 1 �m) | ^ arduino * Nice library, but inside repository https://github.com/richardhmm/DIYRepo/tree/master/arduino/libraries/DSM501 * interrupt driven version https://github.com/Sovichea/dsm501-interrupt/ I tried both of them and on my module they don't report sane results when compared with other sensors. ^ platformio https://primalcortex.wordpress.com/2020/05/23/an-esp8266-air-quality-monitor-based-on-the-dsm501a-dust-sensor/ https://github.com/fcgdam/ESP8266_AirQuality .pre dpavlin@nuc:/nuc/esp8266/ESP8266_AirQuality$ git remote -v origin https://github.com/fcgdam/ESP8266_AirQuality (fetch) origin https://github.com/fcgdam/ESP8266_AirQuality (push) # edit config dpavlin@nuc:/nuc/esp8266/ESP8266_AirQuality$ vi src/secrets.h dpavlin@nuc:/nuc/esp8266/ESP8266_AirQuality$ pio run dpavlin@nuc:/nuc/esp8266/ESP8266_AirQuality$ pio run -t upload --device-port /dev/ttyUSB2 .pre Pins: | Wemos D1 +5V | DSM501a +5V | | Wemos D1 D6 | DSM501a PM 1.0 pin | | Wemos D1 D5 | DSM501a PM 2.5 pin< | | Wemos D1 GND | DSM501a GND pin | ^ description of similar sensor https://github.com/opendata-stuttgart/meta/blob/master/files/ShinyeiPPD42NS_Deconstruction_TracyAllen.pdf |