Circuit Diagram. Advertisement. Partner Content. GD32C231 Series MCU — Redefining Cost-Performance, Unleashing New Potential! ... In the circuit, we use a light-dependent resistor (LDR) as an ambient ...

Furthermore, the vacant solder pads near the three-pin interface header is for mounting a light-dependent resistor (LDR/CdS cell). This, if added, causes the detector to be operational only when the ...