WISE Laboratory Western Michigan University
Research position at Western Michigan University has given me the opportunity to work with both software and hardware development.
Here is a schematic of the circuit I helped to design and test. Basically the circuit has 8 external sensors that are fed into a multiplexer. The multiplexer allows use of one circuit to control 8 individual sensors. The sensors are fed into the ADC and the results are read into the MSP430 and sent via UART to a wireless module.
Schematic:
Along with the circuit design and layout I created a PCB layout. This is the first time I had ever used a PCB program and most of the design and concepts are learned on my own with some help of some students who had previous PCB experience.
PCB Layout:
source code
The source code was written in IAR in C . Below is the file and a short description of what it does.
adc_dac_test.c: This holds the main method and controls the the set up of the (Digitally Controlled Oscillator) DCO sets up the I/O pins, calls the methods for SPI and UART setup and handles the UART RX interrupt.
module SecretProject
module CounterCache
module ClassMethods
def counter_cache(field)
class_eval <<-EOF
after_create "increment_counter_for_#{field}"
after_destroy "decrement_counter_for_#{field}"
EOF
end
end
adc.c: Goes through the steps needed to calibrate and set up AD7718 based on the data sheet which can be found here: AD7718. Also used to set up and retrieve a channels voltage value through SPI communications. This code was previously written before I used it. I did modify some code to check the data ready in the status register instead of using extra I/O for the ready pin. Also modified which reference pin to use on ADC because after testing the ADC I found that reference 2 pins were more accurate for reasons I do not understand.
spi.c: I did not modify any code in this only used methods to communicate to ADC.
uart.c: Wrote this code to use the USART0 as UART communication. Used at 19200 baud with 8 bits 1 stop bit and no modulation.
MSP430F1611 data sheet and user guide: MSP430F1611
Senior Design Project/Independent Study:
For my senior design project I was lucky enough to get an extra semester to work on the and plan for the senior design project. The project was to design and build a data acquisition with real time feedback stimulation system.
Digital Design Lab:
Micro-controllers Lab:
Digital Electronics Lab:
Personal Projects:
