Arduino uno & lcd keypad shield Cover for MH-Z19B (CO2)

thingiverse

▶ MH-Z19B co2 sensor MH-Z19B NDIR infrared gas module is a common type, small size sensor, using non-dispersive infrared (NDIR) principle to detect the existence of CO 2 in the air, with good selectivity, non-oxygen dependent and long life. Built-in temperature compensation; and it has UART output and PWM output. It is developed by the tight integration of mature infrared absorbing gas detection technology, precision optical circuit design and superior circuit design https://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z19b-co2-ver1_0.pdf ------------------------------------------------------------------------------------------------------ This is a case for an Arduino Uno together with an alphanumeric 16x2 LCD and simple keypad shield. * Arduino uno x 1 * Arduino LCD keypad sheild x 1 https://s.click.aliexpress.com/e/6FfJm68 * MH-Z19B co2 sensor : https://s.click.aliexpress.com/e/bLB3B2H2 * DHT22 x 1 https://s.click.aliexpress.com/e/bzGS8PAC ▶ Test results https://youtu.be/cZlm3aSU_SI ------------------------------------------------------------------------------------------------------ ▶ Understanding CO2 Levels CO2 Levels are measured as PPM (Parts Per Million). The standard outdoor level is around 350ppm, and is the optimum level for freshness. However, you can generally get up to 600ppm indoor without any adverse affects. As you can see below, once you get past 600ppm you will start noticing adverse affects. 350 ~ 450 : Healthy, normal outside level 450 ~ 700 : Acceptable level 700 ~ 1000 : Complaints of stiffness and odors 1000 ~ 2000 : General drowsiness 2500 ~ 5000 : Adverse health effects expected 5000 ~ : Time Weighted Averange exposure Limit < hours * Recommended <1000 ppm ------------------------------------------------------------------------------------------------------ ★ STEAMEDU123 ★ ( Science Technology Engineering Art Mathematics ) ▶ homepage : http://www.steamedu123.com ▶ youtube: https://bit.ly/2JcFnQN