Rbelknap: added category tag

2011-02-25T22:29:10Z

added category tag

← Older revision		Revision as of 15:29, 25 February 2011
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	}		}
	</pre>		</pre>
			[[Category:Sensebridge]]

Rachel: New page: I (Rachel) moved the MAXsonar sensor circuit to my own boarduino, successfully. I copied Lamont's shift register/PWM circuit to my own boarduino, again (eventually) successfully. So far t...

2009-04-13T19:38:20Z

New page: I (Rachel) moved the MAXsonar sensor circuit to my own boarduino, successfully. I copied Lamont's shift register/PWM circuit to my own boarduino, again (eventually) successfully. So far t...

New page

I (Rachel) moved the MAXsonar sensor circuit to my own boarduino, successfully. I copied Lamont's shift register/PWM circuit to my own boarduino, again (eventually) successfully. So far this is mere sideways motion... but I have made actual progress in understanding the PWM code, so should soon be able to modify it to include the sensor. Yay tiny progress!

Current unsuccessful code that attempts to read the MAXsonar EZ1's serial out:
<pre>
#include <ctype.h>

#define bit9600Delay 84
#define halfBit9600Delay 42
#define bit4800Delay 188
#define halfBit4800Delay 94
#define PACKET_LENGTH 5

byte rx = 2;
byte tx = 3;
byte SWval[PACKET_LENGTH];

void setup() {
pinMode(rx,INPUT);
pinMode(tx,OUTPUT);
digitalWrite(tx,HIGH);
digitalWrite(13,HIGH); //turn on debugging LED
// SWprint('h'); //debugging hello
// SWprint('i');
// SWprint(10); //carriage return
Serial.begin(9600);
}

void loop() {
Serial.println("begin: ");

// wait for the start of a packet
int allLow = 1;
while(!allLow) {
allLow = 1;
for(int i = 0; i < 10*10; ++i) {
delayMicroseconds(bit9600Delay);
if(digitalRead(rx) == HIGH) {
allLow = 0;
}
}
}
Serial.println("p");

// read a packet
for(int i = 0; i < PACKET_LENGTH; ++i) {
SWval[i] = SWreadNi();
}
Serial.println("r");

// print the packet
// TESTING shows that this bit is BROKEN.
for(int i = 0; i < PACKET_LENGTH; ++i) {
for(int j = 0; j < 8; ++i) {
Serial.print( (SWval[i] >> j) & 1 );
}
Serial.print(" ");
}
Serial.println();
Serial.println();
}

void SWprint(int data) {
byte mask;
//startbit
digitalWrite(tx,LOW);
delayMicroseconds(bit9600Delay);
for (mask = 0x01; mask>0; mask <<= 1) {
if (data & mask){ // choose bit
digitalWrite(tx,HIGH); // send 1
}
else{
digitalWrite(tx,LOW); // send 0
}
delayMicroseconds(bit9600Delay);
}
//stop bit
digitalWrite(tx, HIGH);
delayMicroseconds(bit9600Delay);
}

int SWreadNi() {
byte val = 0;
while (digitalRead(rx) == LOW);
//wait for start bit
if (digitalRead(rx) == HIGH) {
delayMicroseconds(halfBit9600Delay);
for (int offset = 0; offset < 8; offset++) {
delayMicroseconds(bit9600Delay);
val |= (digitalRead(rx) << offset);
}
//wait for stop bit + extra
// delayMicroseconds(bit9600Delay);
// delayMicroseconds(bit9600Delay);
return ~val;
}
}

int SWread() {
byte val = 0;
while (digitalRead(rx));
//wait for start bit
if (digitalRead(rx) == LOW) {
delayMicroseconds(halfBit9600Delay);
for (int offset = 0; offset < 8; offset++) {
delayMicroseconds(bit9600Delay);
val |= digitalRead(rx) << offset;
}
//wait for stop bit + extra
delayMicroseconds(bit9600Delay);
delayMicroseconds(bit9600Delay);
return val;
}
}
</pre>

EBB Notes 3 - Revision history

Rbelknap: added category tag

Rachel: New page: I (Rachel) moved the MAXsonar sensor circuit to my own boarduino, successfully. I copied Lamont's shift register/PWM circuit to my own boarduino, again (eventually) successfully. So far t...