User:Frosti/Sensors, Actuators, and Displays

Hello Speaker and Hello Step I decided to try to start making the board, by drawing it in Eagle.

• I downloaded and installed the Eagle Freeversion from Cad Soft USA
• I downloaded and copied Neils library from http://fab.cba.mit.edu/about/fab/dist/ng.lbr to the folder where other libraries are.

First I drew hello.speaker.45.MTA.

Then I tried to use Inkscape to

I downloaded [AVR Data sheet for Attiny45] from Atmel

I take a look at codes from Fab Hello World page specially at hello.speaker.45.pwm.asm and hello.step.45.asm

AVR

• SBI -> Set Bit in I/O Register
• CBI -> Clear Bit in I/O Register
• LDI -> Load Immediate

• BRNE-> Branch if Not Equal

First we made some experiments

• Open AVR studio
• File New Project
• Write .asm code

include "tn44def.inc";
sbi DDRA, 0;
ldi R18, 10;
LoopA:
	sbi PORTA, 0;
	ldi R19, 15; 
	Loop2:
		dec R19;
		brne Loop2;
		cbi PORTA, 0;
		ldi R19, 20;
		Loop3:
			dec R19;
			brne Loop3
  	dec R18;
  	brne LoopA;

• Build and Run
• Step into

Alternate the code

Define variablbe. .equ sensor_pin = PB3 ; we call pin PB3 a sensor pin .equ charge_pin = PB4 ; PB4 is our charge pin

.def sensor_value_high = R23	; temporary storage for sensor value  (here we store our sensor values (because   we have 10 bit value, here we have the higher value)
.def sensor_value_low = R24	; temporary storage for sensor value (here we store our sensor values (because  we have 10 bit value, here we have the lower value)

; set Chargepin to output
   ;
   cbi PORTB, charge_pin (the charge_pin is set to low)
   sbi DDRB, charge_pin ( charge pin is output

Next we define measuring method.

   ; init A/D
   ;
   cbi ADMUX, REFS2 ; use Vcc as reference
   cbi ADMUX, REFS1 ; "
   cbi ADMUX, REFS0 ; "
   cbi ADMUX, ADLAR ; right-adjust result
   cbi ADMUX, MUX3 ; set MUX to ADC2 (PB4) here we decide what pin we use for measurement
   cbi ADMUX, MUX2 ; "
   sbi ADMUX, MUX1 ; "
   cbi ADMUX, MUX0 ; "
   sbi ADCSRA, ADEN ; enable A/D
   cbi ADCSRA, ADPS2 ; set prescaler to /2 (here we define at what speed we measure)
   cbi ADCSRA, ADPS1 ; "
   cbi ADCSRA, ADPS0 ; "

Links

• Eagle Tour
• [1]
• [2]