Archive for the 'Microcontrollers' Category

Raspberry Pi B+ with rev.2 proto board

Thursday, July 17th, 2014

UPS dropped off three Model B+’s I ordered yesterday morning from Element14 just before 7pm – so I can now join in the Raspberry Pi Model B+ fun!

Raspberry Pi Model B+

(click on the image for larger version)

What I Like:

  • Four USB ports
  • 2A power input
  • switching regulator
  • first 26 GPIO pins are the same
  • more GPIO
  • four good mounting holes
  • uSD socket

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Raspberry Pi Model B+

(click on the image for larger version)

How do Rev.2 “plates” (add-on boards) fit?

I’ll spend a lot more time with my B+’s in the near future, but the first thing I had to try was my EZasPi prototyping board – I wanted to see how much overhang there would be due to the changed position of the GPIO header:

(click on the image for larger version)

You can clearly see the overhang on the left above.

The new GPIO connectors causes previous generation add-ons to shift over the USB/LAN sockets  about 9mm past the edge of the new Raspberry PI Model B+ printed circuit board.

Here are a couple of more views of the shift:

Raspberry Pi Model B+ with EZasPi

(click on the image for larger version)

(click on the image for larger version)

I downloaded the latest NOOBS, and tomorrow I’ll fire up my new Pi’s.

This will be fun.

 

 

Pi Jumper – Ultimate Breakout for Raspberry Pi

Monday, July 7th, 2014

3.3v regulator, 5V I2C, 3.3V I2C and breadboard headers!

I designed Pi Jumper specifically to make it easier to learn about electronics and interfacing with the Raspberry Pi.

Pi Jumper Large Breadboard

(click on the photo for a larger image)

Pi Jumper Plus even plugs right into breadboards!
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Pi Jumper Plus plugged into large breadboard

(click on the photo for a larger image)

More photos and detailed information (including pricing) is available on the Pi Jumper product page at:

https://www.mikronauts.com/raspberry-pi/pi-jumper/

Servo Power

Saturday, June 21st, 2014

Now that HexPi has all his hair servo extensions, I’ve decided I need to make a better power distribution board for TBMST than my first effort (shown below) for the NiCd R/C battery packs.

This time, I plan to use an ATX power supply with separate power feeds for servos 1-8, 9-16 and 17 & 18 as the next experiment. It will be interesting to see if the MG-995’s behave better with more instantaneous current being available.

I also made two modified servo extension cables that allow me to replace the power from the servo connector with external power so I can use the normally Pi 5V powered servo connectors with the ATX supply.

RoboPi can already accept separate power sources for the two servo banks (P0-7 and P8-15) on the svt2 and svt3 headers.
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The Better Mousetrap Servo Tester @Mikronauts https://Mikronauts.com/

 (click on image for larger version)

I’ll be posting the results of this latest experiment as they become available!

HexPi gets shoes!

Wednesday, June 18th, 2014

I finally had time to work some more on HexPi.

I added 50cm extensions to all the servos, cleaned up the wiring, and gave HexPi three pairs of new shoes!

HexPi @Mikronauts https://Mikronauts.com

(click on the image for a larger photo)

For about what I just added, and the whole build log, please click on the HexPi link below:

Related Links:

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Hantek 1008B Oscilloscope Review

Tuesday, June 17th, 2014

Some time ago I purchased a Hantek 1008B USB Oscilloscope specifically for high speed monitoring of up to eight analog channels. I decided to set it up to help me with HexPi and TBMST, as I’ve found my 100MHz/1Gsps scope’s two channels to be too limiting for the multi-channel tests I wanted to run.

I thought teachers, students and hobbyists might find a review useful:
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https://www.mikronauts.com/reviews/hantek-1008b-oscilloscope/

At <$100 shipped, it turns out to be a bargain.