tutorials:learn:sensors:tmp36.html
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tutorials:learn:sensors:tmp36.html [2010/10/07 19:37] daigo |
tutorials:learn:sensors:tmp36.html [2016/01/28 18:05] (current) |
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| - | These stats are for the temperature in the Adafruit shop, the [[http://www.ladyada.net/media/sensors/TMP35_36_37.pdf|Analog Devices TMP36]] (-40 to 150C). Its very similar to the LM35/TMP35 (celsius output) and LM34/TMP34 (farenheit output). The reason we went with the '36 instead of the '35 or '34 is that this sensor has a very wide range and doensn't require a negative voltage to read sub-zero temperatures. Otherwise, the functionality is basically the same. | + | These stats are for the temperature sensor in the Adafruit shop, the [[http://www.ladyada.net/media/sensors/TMP35_36_37.pdf|Analog Devices TMP36]] (-40 to 150C). Its very similar to the LM35/TMP35 (celsius output) and LM34/TMP34 (farenheit output). The reason we went with the '36 instead of the '35 or '34 is that this sensor has a very wide range and doensn't require a negative voltage to read sub-zero temperatures. Otherwise, the functionality is basically the same. |
| Line 163: | Line 163: | ||
| // converting that reading to voltage, for 3.3v arduino use 3.3 | // converting that reading to voltage, for 3.3v arduino use 3.3 | ||
| - | float voltage = reading * 5.0 / 1024; | + | float voltage = reading * 5.0; |
| + | voltage /= 1024.0; | ||
| // print out the voltage | // print out the voltage | ||
| Line 171: | Line 172: | ||
| float temperatureC = (voltage - 0.5) * 100 ; //converting from 10 mv per degree wit 500 mV offset | float temperatureC = (voltage - 0.5) * 100 ; //converting from 10 mv per degree wit 500 mV offset | ||
| //to degrees ((volatge - 500mV) times 100) | //to degrees ((volatge - 500mV) times 100) | ||
| - | Serial.print(temperatureC); Serial.println(" degress C"); | + | Serial.print(temperatureC); Serial.println(" degrees C"); |
| // now convert to Fahrenheight | // now convert to Fahrenheight | ||
| - | float temperatureF = (temperatureC * 9 / 5) + 32; | + | float temperatureF = (temperatureC * 9.0 / 5.0) + 32.0; |
| - | Serial.print(temperatureF); Serial.println(" degress F"); | + | Serial.print(temperatureF); Serial.println(" degrees F"); |
| delay(1000); //waiting a second | delay(1000); //waiting a second | ||
| Line 227: | Line 228: | ||
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| // converting that reading to voltage, which is based off the reference voltage | // converting that reading to voltage, which is based off the reference voltage | ||
| - | float voltage = tempReading * aref_voltage / 1024; | + | float voltage = tempReading * aref_voltage; |
| + | voltage /= 1024.0; | ||
| // print out the voltage | // print out the voltage | ||
| Line 236: | Line 238: | ||
| float temperatureC = (voltage - 0.5) * 100 ; //converting from 10 mv per degree wit 500 mV offset | float temperatureC = (voltage - 0.5) * 100 ; //converting from 10 mv per degree wit 500 mV offset | ||
| //to degrees ((volatge - 500mV) times 100) | //to degrees ((volatge - 500mV) times 100) | ||
| - | Serial.print(temperatureC); Serial.println(" degress C"); | + | Serial.print(temperatureC); Serial.println(" degrees C"); |
| // now convert to Fahrenheight | // now convert to Fahrenheight | ||
| - | float temperatureF = (temperatureC * 9 / 5) + 32; | + | float temperatureF = (temperatureC * 9.0 / 5.0) + 32.0; |
| - | Serial.print(temperatureF); Serial.println(" degress F"); | + | Serial.print(temperatureF); Serial.println(" degrees F"); |
| delay(1000); | delay(1000); | ||
/home/ladyada/public_html/wiki/data/attic/tutorials/learn/sensors/tmp36.html.1286480229.txt.gz · Last modified: 2016/01/28 18:05 (external edit)
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