Light Unit with Photo-resistance

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