Matt Godfrey mcgodfrey

mcgodfrey / power_supply.c

Last active January 1, 2016 04:25

Code for power supply display

	/*
	* Voltage and current monitor for lab supply
	*
	* LCD and analog input pin assignments as shown below
	*
	* Matt Godfrey, 2015
	*/

	#include <LiquidCrystal.h>

mcgodfrey / counter.v

Last active April 23, 2020 18:19

Up-down counter (8-bit) in verilog for servo control example

	/*
	8 bit up-down counter.
	Based on code from Mojo tutorial
	https://embeddedmicro.com/tutorials/mojo/pulse-width-modulation
	/\ /\
	/ \ / \
	/ \/ \
	The CRT_LEN determines the period of the resulting counter
	*/
	module counter #(parameter CTR_LEN = 27) (

mcgodfrey / servo_controller.v

Last active December 12, 2021 04:36

Servo controller in verilog. Takes an 8-bit position and converts it into the pwm signal required by a servo motor.

	/*
	servo controller
	Based on code from Mojo tutorial
	https://embeddedmicro.com/tutorials/mojo/servos

	Takes an 8-bit position as an input
	Output a single pwm signal with period of ~20ms
	Pulse width = 1ms -> 2ms full scale. 1.5ms is center position
	*/
	module servo_controller (

mcgodfrey / mojo_top_servo_demo.v

Last active March 6, 2016 04:49

Example servo control module in Verilog. Sweeps 4 servo motors back and forth at different speeds.

	/*
	Servo motor control demo module
	Four servos swing back and forth with different speeds.
	*/
	module mojo_top(
	input clk, // 50MHz clock input
	//remaining default inputs/outputs omitted
	output [3:0] servo_out //PWM output lines for each servo
	);
	//Usual setup code omitted (setting SPI lines, reset, etc.

mcgodfrey / homebrew_temperature_logger_timers.c

Created March 26, 2016 02:12

Code snippet for timers in homebrew temperature logger

	void loop() {
	//poll the timers
	//if any of these have expired then their callback will automatically run.
	conversionTimer.run();
	measTimer.run();
	display_timeout.run();
	//...
	//reset the display timeout timer if a button was pressed
	if(button_up.pushed() \|\| button_down.pushed() \|\| button_select.pushed()){
	display_timeout.restart();

mcgodfrey / homebrew_temperature_logger_buttons.c

Created March 26, 2016 02:15

Code snippet for button presses in homebrew temperature logger

mcgodfrey / homebrew_temperature_logger_temperature.c

Created March 26, 2016 02:18

Code snippet for temperature measurement in homebrew temperature logger

	void measure_temps(){
	DateTime t = rtc.now(); //get the current timestamp
	datetime2str(t, date_str);

	//trigger a temperature measurement
	sensors.begin();
	sensors.setWaitForConversion(false);
	sensors.requestTemperatures();
	conversionTimer.restart(); //Set up timer for temperature conversion to complete
	return;

mcgodfrey / homebrew_temperature_logger_log_file.c

Created March 26, 2016 02:35

Log to SD function from homebrew temperature logger

	/*
	* Logs current temperature data to SD card.
	* Note that the global variable "filename" must be initialised
	* File format is:
	* datestring,sensor0_name,temp0,sensor1_name,temp1,sensor2_name,temp2
	* datestring,sensor0_name,temp0,sensor1_name,temp1,sensor2_name,temp2
	*/
	byte log_temps(char *date_str){
	File f = SD.open(filename, FILE_WRITE);
	if(f) {