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Corrected: AHA! Now I know why you are getting a lot of I2C Errors! You have not connected pins 5, 6 and 7. Pins 5, 6 and 7 are the I2C address selection pins and must also be connected to Vcc orGND. My example program uses address &h90, this means that pins 5,6 and 7 must also be connected to GND. To connect a 2nd DS1621 you need a different address which can be adjusted with these pins. Example: for the 2nd DS1621 connect pin5 to GND, pin 6 to GND and pin 7 to Vcc. This will adjust the 2nd DS1621 address to &h92. I2C Write address of the DS1621: [1][0][0][1][A2 pin 5][A1 pin 6][A0 pin 7][0] As you can see: connecting pin 5,6 and 7 to GND will create I2C address 10010000 -> &h90 &h90 is now the write address and &h91 is the read address Connecting pin 5 and 6 to GND and pin 7 to Vcc will create I2C address 10010010 -> &h92 &h92 is now the Write address and &h93 is now the Read address. The Read address is always the Write address + 1 If you follow the above then a can create an example for reading 2 DS1621Â’s. Greetings, H.J. Windt > AHA! > Now I know why you are getting a lot of I2C Errors! > You have not connected pins 5, 6 and 7. > Pins 5, 6 and 7 are the I2C address selection pins and must also be connected to Vcc orGND. > My example program reads from address &h90, this means that pins 5,6 and 7 must also be connected to GND. > > To connect a 2nd DS1621 you need a different address which can be adjusted with these pins. > Example: for the second DS1621 connect pin5 to GND, pin 6 to GND and pin 7 to Vcc. > This will adjust the second DS1621 address to &h92. > > I2C read address of the DS1621: > [1][0][0][1][A2 pin 5][A1 pin 6][A0 pin 7][0] > > As you can see: connecting pin 5,6 and 7 to GND will create I2C read address 10010000 -> &h90 > > Connecting pin 5 and 6 to GND and pin 7 to Vcc will create I2C address 10010010 -> &h92 > > If you follow the above then a can create an example for reading 2 DS1621Â’s. > > Greetings, > H.J. Windt > > > Hallo > > > > I want to measure 2 temp. and store it in the CF card. > > One of them is the temperature outside. For this I need a cable of +/- 8 meters. > > I donÂ’t know anything of a 12C Expander. But I want to know more about this. > > > > I have connected 1 ds.1621 and pin1 on port9, pin2 on port10,pin4 on min and pin5 on +5volt thatÂ’s all. |
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Re: 2 x DS1612 Temperature (von Hans - 5.02.2006 15:39)Re: 2 x DS1612 Temperature (von Hans - 5.02.2006 15:40)Re: 2 x DS1612 Temperature (von Windt H.J. - 5.02.2006 16:52)Re: 2 x DS1612 Temperature (von Hans - 5.02.2006 17:33)Re: 2 x DS1612 Temperature (von Windt H.J. - 5.02.2006 17:41)Re: 2 x DS1612 Temperature (von Windt H.J. - 6.02.2006 13:17)2 x DS1621 v1.3 (von Windt H.J. - 6.02.2006 13:35)Re: 2 x DS1621 v1.3 (von Hans - 8.02.2006 17:55)Re: 2 x DS1621 v1.4 (von Windt H.J. - 8.02.2006 19:13)Re: 2 x DS1621 v1.4 (von Hans - 8.02.2006 20:00)