Physical computing transistor solenoid tutorial - Automated Nepalese standing bells

Meditation automation. How to strike standing bells with solenoid mallets from Arduino with millis(). Say goodbye to blocking delay()

Setup

You can click the image to play the associated YouTube video

Schematic

BOM

€  14,00 Adafruit Metro Mini 328 5V 16MHz microcontroller
€  16,00 2 TDS-10A 12V 8,0mm solenoids
€   2,00 2 Infineon Technologies IRFZ44N MOSFETs
€   1,00 2 ON Semiconductor 1N822 Schottky diodes
€ 270,00 2 Nepalese standing bells
€  14,00 2 Soft natural rubber/felt mallets
€  65,00 2 Laser-cut steel mounting brackets
€   6,00 Brass and nylon screws, washers and nuts
€   4,00 Half-size transparent breadboard
€   2,00 Breadboard mini modular black
€   1,00 Jumper cables
€   1,00 2,1mm DC barrel-jack
€   1,00 100 µF 25V el. cap
€  14,00 MEANWELL GST25E18-P1J PSU
€ 411,00

Useful links

μc https://www.adafruit.com/product/2590
Nepalese standing bells https://www.polyglobewebshop.com/acama/index.php?
MOSFET https://www.infineon.com/dgdl/irfz44npbf.pdf?fileId=5546d462533600a40153563b3a9f220d
Schottky diode https://www.onsemi.com/pub/Collateral/1N5817-D.PDF