8 channel thermocouple based temperature data logger


Posted on Feb 5, 2014

You need to wire 8 Max6675 ics to a microcontroller. You can parallel all the clock inputs. The NCS lines of numbers 1 and 2, 3 and 4 etc can be connected together. The SO lines of all the odd numbered Max6675 can be connected together, as can the even ones. That way you can read 8 temperatures on 7 wires (1 clock, 2 data and 4 not chip select) the first


8 channel thermocouple based temperature data logger
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is a simple 8 channels / 12 bit ADC connected to the parallel port of a personal computer that is able to measure eight voltage and to transfer them to a PC. The second is the schematic for a 16 channel Temperature data logger but how you can see he is using a MAX 187 that i dont think is good for my temperature goal. and both send the captured data to a pc with a serial port Actually the MAX6675 that Diver300 suggested would appear to work like a charm, SPI is not a tough bus to work with and you can plunk an SPI EEPROM like the 25LC256 no problem. Here`s the rub, if you know what your doing it could be done in 10 days but that`s if you`ve already got the parts and the design started. You still have to program and debug any working design. As with all thermocouple circuits, the voltage on the thermocouple is tiny and noise can be a problem. I had some problems getting rid of noise, (I can`t remember the details) but it was on a board switching 10A at 230V ac. If it`s not for school and if it`s not for hobby (who need`s +1000 °C in his living room) then it`s for industry. Then ther`s only one way to do it in 10 days; order one of these: the first is a simple 8 channels / 12 bit ADC connected to the parallel port of a personal computer that is able to measure eight voltage and to transfer them to a PC. The second is the schematic for a 16 channel Temperature data logger but how you can see he is using a MAX 187 that i dont...




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