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Description
LIGHT is a light intensity sensor unit with an adjustable photoresistor。
A photoresistor is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity, and vice versa. It exhibits photoconductivity which make it possiable to detect the varies based on Voltage, and use a AD to convert the digital data.
We add some extra work to strengthen the circult, a Dual Differential Comparators LM393, compares the differntial voltage between the photoresistor and the varistor. It could offer larger and accuracy range of light intensity.
Product Features
- 10K adjustable resistor
- Software Development Platform: Arduino, UIFlow(Blocky,Python)
- Two Lego-compatible holes
Kit includes
- 1x LIGHT Unit
- 1x Grove Cable
Learn
Example
1. Arduino IDE
The code below is incomplete. To complete code, please click here.
#include <M5Stack.h>
// declaration
uint16_t analogRead_value = 0;
uint16_t digitalRead_value = 0;
// initialization
M5.begin();
dacWrite(25, 0);// disable the speak noise
pinMode(26, INPUT);// LIGHT Pin setting
// read data
analogRead_value = analogRead(36);// read analog value of LIGHT
digitalRead_value = digitalRead(26);
2. UIFlow
To get complete code, please click here.
More information
Schematic
PinMap
| M5Core(GROVE B) | GPIO36 | GPIO26 | 5V | GND |
| LIGHT Unit | AnalogSignal Pin | DigitalSignal Pin | 5V | GND |
