Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Adapting graphical LCD with touch screen to ChipKIT UNO32

ChipKIT is an excellent substitution board for Arduino. It offers better performance as it is based on a PIC32MX320F128 microcontroller based on 32-bit architecture. The microcontroller has 128K of Flash and 16K of SRAM onboard. Having Arduino Uno shape factor, ChipKIT offers more than 42 programmable pins. ChipKIT, like Arduino, can be programmed with a bootloader that communicates to the PC through USB-to-USART converter chip FT232RQ. Digilent has developed an STK500v2 based bootloader that works on PIC, so it is easy to program using the AVRDUDE tool. Besides that, they adapted an Arduino environment to work with ChipKIT boards. It’s called Mpide. It also supports Arduino boards, but it aims to program ChipKIT boards. Programming experience is pretty the same as for Arduino, and even most of the examples written for Arduino work on ChipKIT. This is true since there are no specific hardware elements touched like program memory or EEPROM. As you know, Arduino is rich in hardware support libraries as all shields are designed for Arduino. Latecomers like ChipKIT, even if they are hardware compatible, may have some difficulties with library integration due to the different architecture.

Continue reading

DIY AVR Graphical LCD test board

Once I’ve got several HQM1286404 graphical LCDs around, I decided to build a prototyping board where I could easily plug LCD to it, read data via ADC and display graphs, and plug keypad if needed for some menu functions. Earlier, I tested graphical LCD on prototype breadboard but dealing with multiple wires (GLCD needs 20) resulted in many failures. It is OK to do simple tasks, but more complex applications require a more stable platform. So here it is: This type of GLCD is a standard 128×64 pixel matrix controlled by the KS0108 LCD controller. I have a smaller non-common pin-header where pins have 2mm step, so I had to draw it for Eagle library, which you will find in project files. I decided to make a simple circuit so it could fit in 100x50mm single-sided PCB. As base MCU, I used Atmega16, which can be replaced with Atmega32, which is pin-compatible with Atmega16 have more data memory.

Continue reading