Kitronik Linear Potentiometer 10K 16mm

This light-activated kit is also available as a temperature-activated project kit. The output of this board can be used to control other electronic circuits, turning them on automatically when it goes light or dark.

The board has space for an LED with a current limit resistor (both available separately) which will light when the output turns on.

The Darlington pair transistor configuration allows an output current of up to half an amp to be controlled. Operating voltage 3V to 12V (lower voltages allow for better adjustment of the switching point).

Note: This kit requires soldering.

Features:

This Light Switch Kit detects the brightness of its surroundings using a Phototransistor.

The kit acts as an automated on/off switch (light dependable) for many devices.

Contents:

1 x 1MΩ Potentiometer.

2 x BC337 NPN Transistors.

1 x Phototransistor.

1 x 220Ω Resistor.

1 x Light Activated Switch PCB

Possible applications include:

Garden light that switches on automatically at night.

Drawer alarm, which sounds when a dark drawer is opened.

Line following robot (using 2 light-activated boards).

Due back in stock early December

The Prong soil moisture sensor for BBC microbit is a sensor board that can be directly mounted to a BBC micro:bit to monitor the moisture present in the soil. The two conductive tines are placed into the soil. Any water or moisture in the soil will conduct to give an analogue voltage that can be read by the BBC micro:bit.

Prong is powered from the 3V supply of the BBC micro:bit. Use either the USB or JST connector on the BBC micro:bit to power the circuit. Prong and the BBC micro:bit can also be powered from the Mi:Power board to create a compact stand-alone unit.

The board has been designed so that the BBC micro:bit can be bolted on using 3 x M3 nuts and 3 x M3 screws. Place the screws through the P1, 3V and GND holes of the PCB and BBC micro:bit, then use the M3 nuts to fasten together on the back of BBC micro:bit. Alternatively, croc-clips can be used to connect between the Prong and the BBC micro:bit.

If using the Mi:Power board then additionally connecting P0 means the BBC micro:bit can sound an alarm if the soil becomes too dry. When fitted to the Prong moisture sensor, the micro:bit can be coded via any of the micro:bit editors, such as the Microsoft MakeCode editor.

Note: To ensure that the Prong moisture sensor has a long and fulfilling life, it is better to write your code to perform a moisture check every so often rather than continuously. When the check is performed continuously it promotes rapid erosion of the electrodes.

Features:

Measure soil moisture levels.

Attaches directly to the microbit.

Use in conjunction with the Mi:Power board to provide power and an audible alarm.

Code with any microbit coding editor.

Contents:

1 x Prong Soil Moisture Sensor for microbit.

3 x M3 Hex Nuts.

3 x M3 Countersunk Screws.

Dimensions:

Length: 68mm.

Height: 53mm.

PCB Thickness: 1.6mm.

These 100 packs of CR25 0.25W carbon film resistors have a +/- tolerance of 5%. All of the available resistors are in EIA standard colour coding.

The resistors are supplied taped together and then rolled. The resistors are spaced 5mm apart on the roll.

Features:

All varieties are CR25 0.25W carbon film resistors.

Colour bands are EIA standard colour coding.

The tolerance is +/- 5%.

They are taped and rolled with a 5mm spacing.

They are supplied as packs of 100.

Contains:

1 x 100 Packs Of CR25 0.25W Carbon Film Resistors.

Compatible with:

Raspberry Pi Pico

Micro:Bit