What is the range of a photocell resistor?

Photocell Overview In pitch black conditions, the resistance of most photocells will measure in the megaohms range. The typical light resistance of photocells varies by component. The mini photocell, for example, usually produces a resistance between 8-20kΩ in normal lighting conditions.

What does a photocell measure?

Photocells are sensors that allow you to detect light. They are small, inexpensive, low-power, easy to use and don’t wear out. For that reason they often appear in toys, gadgets and appliances. Instead, you can expect to only be able to determine basic light changes.

What range of values do you read from the photocell?

It turns out for an analog input in CircuitPython the maximum values range from 0 to 65535 (or the maximum 16-bit unsigned integer value). If you shine an extremely bright light on the photocell you might see a value near 65k, and if you completely block the sensor you might see a value down near 0.

What is Grove light sensor?

The Grove – Light sensor integrates a photoresistor (light dependent resistor) to detect the intensity of light. The resistance of photoresistor decreases when the intensity of light increases. A dual OpAmp chip LM358 on board produces voltage corresponding to intensity of light(i.e. based on resistance value).

What kind of resistor is a photo resistor?

Photo resistor is also known as the light dependent resistor (LDR).The photo resistor module consists of a light dependent resistor (LDR). LDR is a simple and light sensitive resistor whose resistance changes with the amount of light falls on it.

How is light dependent resistor LDR related to photoresistor?

The process is progressive, and as more light shines on the LDR semiconductor, so more electrons are released to conduct electricity and the resistance falls further. Structurally the photoresistor is a light sensitive resistor that has a horizontal body that is exposed to light. The basic format for a photoresistor is that shown below:

How to read photo resistor with Arduino breadboard?

To read a photoresistor, a voltage divider is created to be able to read it. 1x Arduino. 1x LDR. 1x breadboard. 1x Resistor (10kΩ). As you can see we have 2 ways of connecting through circuit below circuit diagrams.

Which is the default resolution for analogread ( )?

**The default analogRead () resolution for these boards is 10 bits, for compatibility. You need to use analogReadResolution () to change it to 12 bits. pin: the name of the analog input pin to read from (A0 to A5 on most boards, A0 to A6 on MKR boards, A0 to A7 on the Mini and Nano, A0 to A15 on the Mega). The analog reading on the pin.