12 May 2015
The robot is powered by beagleboneblack using a 1500mAh Li Ion Battery with a differential drive mechanism.
Posts tagged with beaglebone black
30 Apr 2015
For a long time I was searching for a good tutorial for BeagleBoneBlack. Since the community is little less for the BBB it was a little hard to get started. But I found a book which is very useful to get started (in my opinion). {every book is unique in its on way}.
"Exploring BeagleBone Tools and Techniques for Building with Embedded Linux" by Derek Molloy.
Here is link to his homepage where he listed almost all contents in the text. The book cover almost every basics you need to know to get started. (BBB, Electronics, Linux, Cross compilation, Git, Opencv, ...)
Most of the other books and tutorials focus on the javascript tool (node). But I didn't feel so good with it. This book mainly focus programming the BBB using c which I feel good. You will find an e-book here.
"Exploring BeagleBone Tools and Techniques for Building with Embedded Linux" by Derek Molloy.
Here is link to his homepage where he listed almost all contents in the text. The book cover almost every basics you need to know to get started. (BBB, Electronics, Linux, Cross compilation, Git, Opencv, ...)
Most of the other books and tutorials focus on the javascript tool (node). But I didn't feel so good with it. This book mainly focus programming the BBB using c which I feel good. You will find an e-book here.
18 Apr 2015
Finally start working properly. Need a better voltage regulator and a better battery pack! Voltage spikes when BeagleBoneBlack starts. After a while the BBB will shutdown due to voltage fluctuations… :-( WiFi module in BBB is drawing so much current.
01 Mar 2015
Follow the instruction to enable the ADC and read outputs from the file.
echo BB-ADC > /sys/devices/bone_capemgr.9/slots
(*There may be slight variation for directories. Figure this out if not working.) Verify whether ADC is loaded by
cat /sys/devices/bone_capemgr.9/slots
Read ADC value by
cat /sys/bus/iio/devices/iio\:device0/in_voltage0_raw
Here AIN0 (PIN39 on P9) is connected to a potentiometer. Do not exceed the voltage above 1.8V. This will damage the BBB.
Its a 12 bit ADC. So maximum value will be 4096. To calculate value in voltage,
(1.8/4096) *ADC_Value
I wrote a bash script to do this work.
For this script to work install bc on BeagleBoneBlack. bc is a small program to do mathematical calculation from terminal.
apt-get install bc
Save the above bash script to a file (adc_bash) and set permission to execute by
chmod +x adc_bash
To run it every 0.5 second,
watch -n 0.5 ./adc_bash
Once finished with the ADC you can unexport it. But it will cause a kernel panic. So its better not to do it. So the best way is to restart the BBB or leave it as is. If you want to unexport it,
echo -7 > /sys/devices/bone_capemgr.9/slots
where 7 is the number corresponding to BB-ADC in
cat /sys/devices/bone_capemgr.9/slots
For more detail refer here.
echo BB-ADC > /sys/devices/bone_capemgr.9/slots
(*There may be slight variation for directories. Figure this out if not working.) Verify whether ADC is loaded by
cat /sys/devices/bone_capemgr.9/slots
Read ADC value by
cat /sys/bus/iio/devices/iio\:device0/in_voltage0_raw
Here AIN0 (PIN39 on P9) is connected to a potentiometer. Do not exceed the voltage above 1.8V. This will damage the BBB.
Its a 12 bit ADC. So maximum value will be 4096. To calculate value in voltage,
(1.8/4096) *ADC_Value
I wrote a bash script to do this work.
For this script to work install bc on BeagleBoneBlack. bc is a small program to do mathematical calculation from terminal.
apt-get install bc
Save the above bash script to a file (adc_bash) and set permission to execute by
chmod +x adc_bash
To run it every 0.5 second,
watch -n 0.5 ./adc_bash
Once finished with the ADC you can unexport it. But it will cause a kernel panic. So its better not to do it. So the best way is to restart the BBB or leave it as is. If you want to unexport it,
echo -7 > /sys/devices/bone_capemgr.9/slots
where 7 is the number corresponding to BB-ADC in
cat /sys/devices/bone_capemgr.9/slots
For more detail refer here.
