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Light sensor Dark sensor. Light and dark detection using an LDR. For this project, let’s stick to the LDR sensor module so we can select the light or dark detection by placing jumpers. We’ll be using ...
LDR SENSOR is nothing but a light-dependent resistor, its resistance changes according to changes in light intensity. In this blog we will discuss what LDR SENSOR is and how it can be used with the ...
Wi-Fi module ESP8266 (NodeMCU) ... It is built around NodeMCU (ESP8266), an LDR, DHT11 sensor, opto-coupler 4N33 (IC2 to IC3), two relays ... It has 3.3V inbuilt voltage regulator and CP2102-based USB ...
The circuit of Arduino-based shadow alarm is shown in Fig. 1. It consists of an Arduino board, power supply, light-dependent resistor (LDR) sensor, buzzer, relay driver and a few other components.