Here’s our first RPiB+ HAT compatible board Breakout!+.
4 new PCB’s arrived in the post today. These are my first HAT’s (Hardware on Top) for the Raspberry Pi B+.
Top (L-R) – UserPort and Breadboard+, Bottom (L-R) – DIO32 and Breakout!+
All the boards adhere to the standard HAT size and include a ID EEPROM.
UserPort is probably my favourite. It’s a mimic of the BBC’s micros digital User Port and Analogue Port. Digital I/O is provided by a I2C MCP23017 16-channel Port Expander and Analogue Inputs by a 4-channel SPI MCP3004 10-bit ADC.
Breadboard!+ is a reworking of my earlier 170-pin Breadboard module but the extra size for a HAT PCB has allowed the inclusion of a two tactile push switches and three LED’s. As well as these, there’s also 4x Analogue Inputs using a 4-channel MCP3004 10-bit ADC.
DIO32 is a 32-channel Digital I/O board with two MCP23017 I2C Port Expanders.
Breakout!+ allows easy access to the I2C, SPI and UART interfaces and includes a small prototyping area for building circuits on.
Hope to have them on our Tindie store soon :-)
My Raspberry Pi B+ arrived last week. So far not had much time to do anything with it but like the improvements I’ve seen so far.
I design my first Pi MIDI interface way back in 2012 while I was waiting for my first Pi board to arrive.
It’s went through several revisions since then and now looks like this:
The circuit is now completely 5V as per the original MIDI specification but the MIDI IN is 3.3V compatible with the Pi via a voltage divider circuit.
OK that’s the hardware what about the software?
Getting a MIDI 31250 Baud Rate on a Pi is not easy as it should be as 31250 is not a standard Pi baud-rate. But you can trick your Pi into it if you overclock (or rather underclock) the UART clock.
Start a terminal session and type:
sudo nano /boot/config.txt
Add these lines to the end of the file
# Change UART clock to 2441406 for MIDI 31250 baud rate init_uart_clock=2441406 init_uart_baud=38400
save and exit.
Once saved reboot your Pi.
Next we need to stop the serial UART being used by Raspbian for the shell console. Check my previous post “MiniPIiio RS232 set-up” on how to do this.
Finally we need to add the following to “cmdline.txt”
After doing all of this we should be ready to connect a MIDI keyboard or synth to our Pi.
Again I hope to have it stocked in out our store on Tindie soon:
Here’s a photo of a finished RPi-X PIAC experimenter module:
PIAC = Pi Industrial Automotive Controller
It’s a Pi expansion shield that has 4x Change Over (CO) relays, 4x Opto Isolated Digital inputs and 4x 0V to 10V Analogue Inputs. There’s also a RS485 interface to communicate with industrial networks.
You can use it to learn about industrial control or perhaps even use it on your own small control projects.
I hope to have it stocked in our Tindie store soon:
Saturday’s postman delivered my first RPi Compute Modules and IO board.
I didn’t have much time to do any thing with it except marvel at compact it is.
I hope to take some pictures in the next day or two and post them.
I’ve some cool ideas for what I’m going to make with it so pop back soon.