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  • Jrobot Delivery 6 months ago

    Hi There, Thanks for your interest in Jrobot. There are actually 3 episodes of Jrobot series. You can find all 3 on Youtube. Jrobot Delivery is the 2nd one.  You can find my contact in the 1st episode, towards the end of the video. Cheers.
    Joe

  • Jrobot Self Drive Powered by TensorFlow Lite about 3 years ago

    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. 

  • Jrobot Self Drive Powered by TensorFlow Lite about 3 years ago

    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. 

  • Jrobot Self Drive Powered by TensorFlow Lite about 3 years ago

    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. 

  • Jrobot Delivery over 3 years ago

    Hi, I'm from Sydney Australia.

  • Jrobot Delivery over 3 years ago

    Hi Thierry
    Thanks for your viewing. To find out more, you can also search and watch the first episode of Jrobot, which explains the design and function of Jrobot system in more details. Right now, there is only one Jrobot Delivery, but we plan to make more and do more testing, watch this space. 
    Regards
    Joe

  • Jrobot Delivery over 3 years ago

    Hi There, 
    Thanks for your viewing. I have dropped you a message. Any query is more than welcome. 
    Regards 
    Joe

  • Jrobot Delivery over 3 years ago

    Hi, thanks for your viewing. The motor driver I use is TB6612FNG, better efficiency than L298N, very cheap, but the power rating is a bit low, works ok with small size device like Jrobot. There are plenty more powerful drivers on sparkfun, if you need them. 
    Regards
    Joe

  • Jrobot Delivery over 3 years ago

    Hi Steve
    Thanks for your viewing.
    I use dc 12v motors with gear box, 200rpm, try to balance between torque and speed, budget range from ebay, not with the best efficiency. 
    Compass is tricky, HMC5983 or HMC5883, the trick is it needs calibration on your device. there are many reference online on the topic, After I installed it on the robot, I turn it around a few times, log the raw data, draw the dots on office excel, then adjust the drawing to perfect circle. Even after that, it does not always give correct reading, interference from the circuits and nearby objects I guess. At this stage, I just read it, not yet use it to drive the robot. 
    Logically the next stage, I will look into auto pilot, or a certain degree of auto pilot, then direction becomes critical. Direction can also come from GPS, cross check between the 2 sources maybe. 
    Again thanks for your interest.
    Regards
    Joe

  • Jrobot Delivery over 3 years ago

    Hi There,
    Thanks for your email.
    I use a lipo battery, ftom turnigy, a 5000mah one, enough to run for hours. 
    Regards
    Joe

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