Catalog excerpts
MPM-20A DUST SENSOR MODULE S P E C I F I C AT I O N Shenzhen MemsFrontier Electronics Co., Ltd.
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MPM-20A DUST SENSOR MODULE Product Introduction MPM-20A dust sensor module uses the principle of optical scattering to detect the concentration of dust in the air. The sensor has a built-in infrared lightemitting diode and a highly sensitive photoelectric sensor. The light emitted by the light-emitting diode will produce reflected light when encountering dust. The photoelectric sensor reflects the concentration of dust in the air by detecting the intensity of the reflected light, and the sensor directly outputs the PWM signal; it can also output the dust concentration value through the IIC...
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MPM-20A DUST SENSOR MODULE Performance Index 1) Specifications Working Voltage Working Current Operating Temperature and Humidity Storage Temperature Detection Particle Diameter Detection Concentration Range Detection Consistency Error Output Mode PWM pulse output or UART/ IIC digital interface output Detection Start Time About 1 minute after turning on the power (resistance temperature stabilization time) Power input terminal (ground terminal) UART_RX / IIC_SDA Power input terminal (+5V terminal) UART_TX / IIC_SCL 1. Connect to MCU input or floating: output sensor data PWM signal; at the...
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MPM-20A DUST SENSOR MODULE 2) Lifespan Light source life: more than 5 years with continuous power supply. 3) Signal Output a. PWM signal output (average value): TL is the cumulative time of the low pulse during TA time. The relationship between accumulated time of low pulse and dust concentration: Dust concentration (ug/m3) = TL / TA * 4000 (TA can take 8～32 seconds) You can also read the width of a single low pulse and convert it to a dust concentration value: Dust concentration (ug/m3) = single low pulse width (ms) * 4 b. UART Signal Output: When the PWM pin is connected to the MCU input...
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MPM-20A DUST SENSOR MODULE c. IIC Signal Output: When the PWM pin is connected to GND, the IIC digital output port is selected. The dust concentration value can be obtained by reading the internal register of the dust sensor module through the IIC interface. IIC Communication Interface: The host generates 8 clock pulses to send 8 bits of data. On the 8th falling edge of the SCL bus, the device changes the SDA output as an input, and reads the response value on the 9th clock pulse. After the 9th clock pulse, the data receiving device pulls the SCL bus low if the next reception is not ready,...
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MPM-20A DUST SENSOR MODULE Table 3-2, IIC Output Interface Data Format IIC Register Address Function Description Sensor type identifier, read out as fixed character 'I' Bit [7] (bit[7]) is 1, means the dust concentration data of the sensor is available. If it is 0, means the dust concentration data of the sensor is unavailable. A change in the value of bit [3:0] (bit[3:0]) indicates that the dust concentration data of the sensor has been updated, which facilitates data processing after querying the data. Bits [6:4] (bit[6:4]) are reserved. Sensor dust concentration data high 8 bits (average...
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