// light
LDR (Photoresistor)
Analog light-dependent resistor
€4.50
avg eur
Analog
Pins
2
Specs
3
Libraries
1
Protocols
1
// wiring → esp32 devkit v1
One leg
3V3
EN
GPIO36
VP
GPIO39
VN
Other leg
GPIO34
GPIO35
GPIO32
GPIO33
GPIO25
GPIO26
GPIO27
GPIO14
GPIO12
Other leg
GND
GPIO13
ESP32
WROOM-32
devkit v1
USB
VIN
5V
GND
GPIO23
GPIO22
SCL
GPIO1
TX0
GPIO3
RX0
GPIO21
SDA
GPIO19
MISO
GPIO18
SCK
GPIO5
SS
GPIO17
TX2
GPIO16
RX2
GPIO4
GPIO2
GPIO15
sensor pin (left)
sensor pin (right)
unused
// pinout → esp32
| Sensor Pin | ESP32 Connection |
|---|---|
| One leg | 3.3V |
| Other leg | GPIO 34 + 10kΩ to GND |
// technical specs
Resistance
~1kΩ (light) – 1MΩ (dark)
Output
0–4095 ADC
Voltage
3.3V
// github libraries
// notes & warnings
Use ADC1 (GPIO 32–39). ADC2 conflicts with WiFi. Voltage-divider with 10kΩ resistor.
// related sensors · light
Submitted by caio.ricciuti@outlook.com
· Apr 26, 2026