AXE033/i2c revisited/18X-DS1307 ckt

[SIRA]

As in AXE033, page #7, I have used the s/w and h/w,"Using the optional Clock [DS1307] upgrade in i2c mode". A LED is connected to leg#7 of DS1307 through a resistor to the +Vcc rail. When I run the following program, the LED comes ON (dim) instantly and then after a few seconds becomes bright. As per my program the LED has to turn ON after 2 minutes, and turn OFF afetr 20 seconds.
Would some one please pick the mistake?

symbol hour=b2
symbol minute=b1
symbol second=b0
main:
i2cslave %11010000,i2cslow,i2cbyte
writei2c 0,($00,$57,$11,$05,$18,$11,$06,$10)
end

i2cslave %11010000,i2cslow,i2cbyte
Loop1:

Pause 30000 ;wait 30sec
readi2c 0,(b0,b1,b2);read sec,min,hour
if b2<>11 then loop1;if hour not 11 goto loop1
if b1<>59 then loop1;if min not 59 goto loop1
high 7 ;turn ON led/buzzer
pause 20000 ;wait 20sec
low 7 ;turn OFF led/buzzer
pause 60000 ;wait 60sec
goto loop1

 

[Technical]

These three lines are only used the very first time you use the AXE033 (to set the time). They should not be in your normal program, so delete them.

i2cslave %11010000,i2cslow,i2cbyte
writei2c 0,($00,$57,$11,$05,$18,$11,$06,$10)
end

 

[SIRA]

Technical: I have assembled the 18X and the DS1307 on a bread-board, with legs# 7 and 10 on the 18X as SCL & SDA respectively.
Are "high 7" and "low 7" for leg#7 of the DS1307 or leg#13 of 18X?
Following your instruction, I separated the program into two parts, "read" and "write". Though the downloading of these programs have been successful, yet the response is not as expected. Why?

 

[BeanieBots]

I'm a bit confused about which pin you are trying to control. Leg/pin PICAXE/DS1307.

High 7 will set output 7 (pin 13) of the 18X high.
You are also wrinting to the DS1307 control register which controls the state of leg7 on the DS1307.
You are sending it $10 which at a quick glance in the data sheet will turn on the 1Hz output (SQWE) on pin 7 of the DS1307.
Have you remembered the 4k7 pullup resistors for the I2C lines.

write $07($80) to make it high
write $07(0) to make it low
write $07(10) to make it flash at 1Hz.


Edited by - beaniebots on 20/11/2006 21:11:05