Dobrica Pavlinušić's random unstructured stuff
DSM501A: Revision 13
dsm501-schema.png

dsm501.pdf

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

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

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

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

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