Month: January 2017

Big Rob – Raspberry Pi robot motor driver BTS7960B and Python program

First I tried a small H-Bridge with 2.5 A to supply the DC motors with energy. But this type of motor driver was too small at that point the robot tried to turn on spot the motor driver burned out. Then I bought an upgrade for my Big Rob and now I am able to drive around and to turn on the spot without burning the motor driver. I searched for a motor driver with more than 10 A on each motor out. I found a motor driver with a total of 43 A and it could be controlled...

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Big Rob – power train

This article describes the components I build by myself or I bought for the power train. The power train are all components the robot needs to mount the big buggy tires and to get the tires spin. The DC gear motors are very strong and that’s the reason why the power train has to be very stable. Additional to all the torque of the DC motors the payload of the robot should be high enough to mount an additional box on top of the chassis of the robot for further technical equipment. The picture below shows the main pieces...

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Big Rob – A Raspberry Pi powered robot

Big Rob is the latest robot I designed for off-road activities. The robot will be equipped with the latest technology like a precise navigation with the differential GPS architecture I built up. You will find more details about the differential GPS setup here. The big buggy tiers enable the robot to drive off road and not to get stuck in rough terrain like the little Raspberry Pi robots I already build and tested in the garden. The DC gear motors have a rotate speed of 35 RPM by 12V. The rated stall current is 1.8 A and the output torque is 15...

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Precise GPS GNSS positioning with a Raspberry Pi and the RTKLIB – configuration RTKLIB base station

In the previous article described how to install the software for the RasPiGNSS module. After installing the software a short check was performed that the Raspberry Pi together with the RasPiGNSS GPS receiver is working in general. This article describes how the base stations for the precise GPS positioning setup has to be configured. The base stations operates outdoors during sunny and rainy days. This is the reason why all the electronics have to be protected against bad weather conditions. It is important to use a water resistant / water proof case for all the electronic components. I build...

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