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Arduino Nano with Atmel 328p (£4)
I had issues compiling the nrf9000 library to run on the Atmel128
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Dual DC motor driver based on the TB6612FNG (£4)
(https://www.google.com/search?tbm=shop&hl=en-GB&source=hp&biw=&bih=&q=tb6612fng)
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nrf8001 BLE module with SPI connectivitiy (£11)
(https://www.google.com/search?tbm=shop&hl=en-GB&source=hp&biw=&bih=&q=nrf8001)
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"Smart car kit" robot platform (base, motors, wheels, battery holder) (£9)
These can be found on Ebay and from a number of sources
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Raspberry PI 4 (£34) + Raspbian SD card (£6)
Ideally I'd use a Raspberry Pi Zero W and add a USB BLE dongle but so far I stick to the RPi 4 that features Wi-Fi+BLE
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USB power bank (£12)
The RPI is powered separately from the car, I haven't measured autonomy, a measurement I did a couple of years ago suggested that a Poundland £1 powerbank could sustain a RPi Zero W doing video streaming for 2 hours.
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Raspberry Pi wide angle lens camera (£15)
Any other camera will do but FPV works better with a wide FOV
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