MonkMakes Servo Clip for BBC Micro:bit

Pulleys & Belts poster is a colourful and engaging wall chart that teaches school pupils about the two major types of pulleys – a simple fixed pulley and a block and tackle system – as well as different belt and pulley systems. It also outlines how to calculate the velocity ratio for different sizes of driver pulley and driven pulley.

Its curriculum-focused information clearly explains every component of this challenging Design and Technology module. Alongside each concise yet accurate information block is a colourful, associated diagram which makes the intricate topic of pulleys and belts easier to understand and use in a real-life situation. The poster’s large A1 size, fresh design and eye-catching colours make it a must-have addition to any Design and Technology learning environment, including formal classrooms and home-schooling spaces.

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.

High-quality A/B grade Black American Walnut Veneered MDF panel measuring 300mm x 200mm. Ideal for structural projects requiring a high-quality appearance and finish on both the topside and panelling. Suitable for laser cutting. This MDF panel is veneered on both faces of the sheet: A grade veneer on the front and B grade on the reverse.