adafruit / adafruit_tmp007_library

Arduino library for Adafruit TMP007 Thermopile sensor Breakout

Adafruit TMP007 Infrared Thermopile Sensor

This is a library for the Adafruit TMP007 Infrared Thermopile Sensor

Pick one up today in the adafruit shop!

• https://www.adafruit.com/products/2023

These displays use I2C to communicate, 2 pins are required to interface

Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!

Written by Limor Fried/Ladyada for Adafruit Industries. BSD license, check license.txt for more information.

All text above must be included in any redistribution

To install, use the Arduino Library Manager and search for "Adafruit TMP007 Library" and install the library.

adafruit_tmp007_library's Issues

arduino ide 1.6.4 retrieves older version of this library

when i installed this today from within the library manager feature of arduino ide 1.6.4, it pulled in the version that depends on the Adafruit Unified Sensor, however the latest version of the library does not depend on the Unified Sensor library.

how do we go about updating the version the arduino ide points to?

TMP007 initialization needs software reset

Under some circumstances TMP007 POR appears to be ineffective and the initial read16() in begin() ends up being not acknowledged by the device.

Suggested fix: issue a soft reset, which is good practice anyway (no minimum wait time mentioned in datasheet?). Code below - verified with own hardware.

boolean Adafruit_TMP007::begin(uint16_t samplerate) {
	Wire.begin();

	write16(TMP007_REG_CONFIG, // the first read16() can fail if device isn't reset at first
		TMP007_CFG_RESET ); // trigger software reset
	write16(TMP007_REG_CONFIG, 
		TMP007_CFG_MODEON  | // Conversion ON (not power-down)
		TMP007_CFG_ALERTEN | // Makes ALERT pin controlled by the alert flag bit
		TMP007_CFG_TRANSC  | // Transient Correction Enable (enabling sensor voltage and object temperature output filtering)
		samplerate );
	write16(TMP007_REG_STATMASK, 
		TMP007_STAT_ALERTEN | // Alert Flag Enable : any enabled flag in Status register will activate !ALERT pin
		TMP007_STAT_CRTEN );  // Temperature Conversion Ready Enable : CRTF flag in Status register will activate ALRTF
	if(read16(TMP007_REG_DEVID) != TMP007_DEVID_VAL) 
		return false;
	return true;
}

The begin() method samplerate param is the wrong size

Adafruit_TMP007::begin() takes a uint8_t samplerate parameter (line 55 Adafruit_TMP007.h), and sets it by default to TMP007_CFG_16SAMPLE, which is 0x0800, and can't fit in 8-bits. This value is then OR'ed together with a few other bits to set the config flag. The intention is to set hires sampling by default, but because this value is truncated to 0 by the compiler (silently), it instead appears to put the chip in 1-sample-average mode.

Wire.requestFrom should not have beginTransmission nor endTransmission.

In the function "read16()", the Wire.requestFrom() should not be encapsulated by Wire.beginTransmission() and Wire.endTransmission().
The Wire.beginTransmission() and Wire.endTransmission() are only for writing data.