Jrobot Self Drive (episode 3 of Jrobot series) is a self-driving footpath traveler based on machine learning (Keras and TensorFlow Lite).
Project showcase by joechen
Jrobot Delivery is ready to deliver your next pizza!
Jrobot adds wheels to mobile phone and makes it truly mobile. Jrobot on 4G has unlimited range and goes anywhere in the world.
For obstacle or collision avoidance, I think we need hardware before we can program them for the purpose. For Jrobot, I have 3 ultrasound sensors looking at different directions (the ones next to phone camera). They measure the free distance from the car, and override motor control if the distance is below a threshold. This is the lowest layer of control on Jrobot, and the safety layer.
It's about 3kg, plus phone and plus payload, 2 to 3 pizzas should be ok. The car body is not heavy, but battery, motors and wheels are, which I don't have much control.
Thanks for viewing, motors are from aliexpress (or ebay), 37mm gear box motor, there are many ouput speeds available, I picked 200rpm ones, they are very affordable, but maybe not the best efficiency, and they are a bit noisy too. For motor driver, I use tb6612fng, from same place, again widely available and cheap, but not the best, works ok for Jrobot, but I suspect Jrobot can benefit from something that has a bit higher current rating. There are better drivers in places like Sparkfun.
hardware upgrade is more costly than software one.
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