Sensor+Tests

=Sensor tests Amsterdam - Dec 17th 2011=

MG811 CO2 sensor: - Setup: 6V over heater; A-B connection to GND and Analog0 pin (Arduino board) - SW: AnalogReadSerial standard Sketch - Result: 250mV measured over A-B; Which would mean around 30.000 ppm - Improvement: Add OpAmp for higher input resistance; Add onboard 6V supply

[|MH-Z14 CO2 Module] - PWM signal seems to work the best and have the most resolution - response time is less than 30 s - 3 minute warm up time - Seems to need extra power - works when laptop is plugged in, not when working on battery power.

[|MQ-2 CH4][| Sensor] - 24 hour warm up time - need to solder extra wire to access analog output

Code for MH-Z14 CO2 and MQ-2 CH4 Sensor Data from MH-Z14 CO2 and MQ-2 CH4 Sensor, tested outside using moped and bus exhaust

From Jeff De Sadelaer, Job Joossen, Ivo van den Maagdenberg,

DHT11 sensor for temp & humidity (DFROBOT) & LPG GAS SENSOR MODULE (MQ-5) Parallax LPG gas sensor

Code:

comparison DHT11 sensor with professional device Measurement:

Debug logging:

saving save: /save/1/20/48

1319048924 saving save: /save/2/18/50 1319048925

values: sensor1 (DHT11): 48% 20°C

sensor2 (DHT11): 50% 18°C

professional device: 57% 19,8 °C