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Dobrica Pavlinušić's random unstructured stuff

DSM501A

datasheet: dsm501.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

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

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

power supply

It really needs quiet power supply to get any readings which are not just noise.

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datasheet: {file: dsm501.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

^ power supply

It really needs quiet power supply to get any readings which are not just noise.

{image: dsm501-schema.png}