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Blog page on fischertechnik robotics and embedded systems.

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All pictures and videos: copyright Huub van Niekerk

2018
12 January (Playlist)

Arduino Mega2560: Testing SPI again: where does it go wrong at the Uno-side? Slowly a mystery comes to surface, but why does it happen at all? Also, at some other point it does go well..but how come? Click the image to watch the video.

Hand: While trying to improve the yaw cord, I realize that a major reconstruction is needed. But how will this end up? Does the software need change? Click the image to watch the video.

RaspberryPi: Trying the ADC again by rewiring to the original schema and code with a surprising result. Which becomes visible on the oscilloscope after a change of the timebase. Then: how does everything else work? Searching the net gives a clue, but will it work here as well? Click the image to watch the video.

Mirft2: After the new authorization, what happens? Testing with the images gives an unpleasant surprise with the date. What's with the battery? Then with the oscilloscope shows some weirdness on the pwm. What's up? Sensor testing brings confusion. Click the image to watch the video.

Mydfir: Line following again: why is the righthand side not ok? Why is sonar acting strange? Searching for clues in data shows oddities. Is the code ok? Click the image to watch the video.

Arduino Yún: Testing the circuit, then code: why is only 1 value recorded? Some testing reveals 2 problems and a quick solution. Then it's time to replace a potmeter without the need to rewire, but it takes some soldering. Will everything work? Click the image to watch the video.

Discovery: Checking the motors with the oscilloscope reveals that 1 motor has no signal: a problem which is quickly solved. Next: authorization, then: how do the sensors behave? ROBOPro shows all work, so with 1 sensor reporting, what's up? Click the image to watch the video.

Arduino MegaADK & Android: First, testing everything and thinking of improvements. Then: how to increase the delay on the Android? Which value to exceed 1 second? Next: the Arduino... constructing a lamp, rewiring and recoding. Does it work? Click the image to watch the video.

RaspberryPi2 & ROS: Testing shows the current situation works, kind of. Trying several ideas on the messages, what will work? Then some electronics oops. In the end, an idea for next time. Click the image to watch the video.

BeagleBoard & monorail: New rails haven't arrived yet. Testing reveals the balance is off. So first task is to solve this. Then: again some wiring. Time to really solve it. Also: if pressure solves the speed, then adding some weight may help. But how? Click the image to watch the video.


5 January 2018 (Playlist)

Arduino Mega2560: Testing the motor at the Uno side: does it still work? SPI signal on the oscilloscope: what's up? Testing the switch for SPI: what should the result be? Some algorithm change needed. Click the image to watch the video.

Hand: With the new winch, a wire needs to be put in place. Then some testing on the gears, the wrist, the algorithm. What about tension? Direction? Switches? Click the image to watch the video.

RaspberryPi: Testing with a new ADC using ESD, (re)wiring, LDRs, recoding Python. How will it work? Click the image to watch the video.

Mirft2: Continuing with trajectory and sensors: why seems only sensor 2 ok? What does ROBOPro tell ? What does the algorithm look like? Also, the scp command should be automated. Click the image to watch the video.

Mydfir: Testing and reasoning about the sensors leads to some code adjusments with regards to values. Some testing shows this finally maye work, but give straight lines and curves the same result? How about the sonar? Click the image to watch the video.

Arduino Yún: After testing, it's time to use all of the Yún: there's Linux too. As well as a USB memory stick. And some code to change. And an extra ssh terminal. Will it work? Click the image to watch the video.

Discovery: To solve an authentication problem, I need to test. But how is the trajectory? And why? And what's with the batteries? Will change of firmware bring clarity? Click the image to watch the video.

RaspberryPi2 & ROS: Testing shows some rewiring is needed and messaging seems a mess again. But how to solve it? Some replacement is needed too. Will it work? Click the image to watch the video.

BeagleBoard & monorail: Reconstructing the carriage is badly needed, but how will it end up? Some wiring is messed up again, but how to fix it? Again testing using Python and diagnose. Click the image to watch the video.