Trying to figure out if there is any slippage and rotational differences between the right and the left wheels.
Still want to see some uninteresting moves? Here is the video.
Saturday, July 15, 2017
The battery (currently a Lion 3 cell battery) is temporarily attached to the tail, it will go inside the body in the end. Now it comes handy to access it easily to charge or unplug.
To power Raspberri Pi, I'm using a buck (DC to DC) converter, it's just a few dollars worth but produces pretty stable output voltage. I've tried it with my adhustable power supply between 11-15v and it stays 5 volt without fluctuating. I think it uses LM 2596. The datasheet says it can output 2A steady current which is enough for me since I don't use RPi to power anything yet.
One important thing to express again is that there are three different voltages going around the robot; 12 volt, 5 volt and 3.3 volt. If you are not careful you can easily burn things out or damage badly.
To power Raspberri Pi, I'm using a buck (DC to DC) converter, it's just a few dollars worth but produces pretty stable output voltage. I've tried it with my adhustable power supply between 11-15v and it stays 5 volt without fluctuating. I think it uses LM 2596. The datasheet says it can output 2A steady current which is enough for me since I don't use RPi to power anything yet.
One important thing to express again is that there are three different voltages going around the robot; 12 volt, 5 volt and 3.3 volt. If you are not careful you can easily burn things out or damage badly.
Tuesday, July 11, 2017
Well, OK.
It's been some time, but I'm back.
During this time I decided to make some changes / improvements to my robot.
First, I've moved from Arduino to Raspberry Pi 3. It's much more powerful with Quad Core 1.2GHz 64bit CPU, and comes with Wifi and Bluetooth, runs Linux, has direct HDMI outputs.
Second, I upgraded my motors with the ones come with encoder units. And also, the motors produce 320 rpm. With my wheels (6 cm radius) the robot can travel as much as 201 cm/sec which is more appropriate in my opinion. As you can see in the below pictures I put a supporting aliminum u profile under the top body panel to eliminate sagging of the body due to the weight.
Third, I bought Pololu Dual MC33926 Motor Driver Carrier that has a wide operating range of 5 – 28 V and can deliver almost 3 A continuously (5 A peak) to each of its two motor channels. I thought that Parallax HB-25 H bridges were overkill with 25 A and took much more space comparing this new tiny pcb.
And lastly, I've changed my IR sensors from analog to digital. They are from Sharp and 5 cm sensitive.
Curious of the black plastic thing above the sensors?
It's plastic tie lock bumper to absorbe any crash force and to keep sensors safe ;)
It's been some time, but I'm back.
During this time I decided to make some changes / improvements to my robot.
First, I've moved from Arduino to Raspberry Pi 3. It's much more powerful with Quad Core 1.2GHz 64bit CPU, and comes with Wifi and Bluetooth, runs Linux, has direct HDMI outputs.
Second, I upgraded my motors with the ones come with encoder units. And also, the motors produce 320 rpm. With my wheels (6 cm radius) the robot can travel as much as 201 cm/sec which is more appropriate in my opinion. As you can see in the below pictures I put a supporting aliminum u profile under the top body panel to eliminate sagging of the body due to the weight.
Third, I bought Pololu Dual MC33926 Motor Driver Carrier that has a wide operating range of 5 – 28 V and can deliver almost 3 A continuously (5 A peak) to each of its two motor channels. I thought that Parallax HB-25 H bridges were overkill with 25 A and took much more space comparing this new tiny pcb.
And lastly, I've changed my IR sensors from analog to digital. They are from Sharp and 5 cm sensitive.
Curious of the black plastic thing above the sensors?
It's plastic tie lock bumper to absorbe any crash force and to keep sensors safe ;)
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