Temperature Sensor Selection - Page 1
Forum section: electronics / projects

author: rneraslan
author_rank: Contributor
timestamp: April 05, 2017, 09:14:25 am
content: I can not decide what to select temperature sensor for my battery powered project. Can you guys help me to decide?They all low price / high accuracy temperature sensors that I can use. Can you give me some cons and pros about those sensors, those who have experienced this sensor before?Here are some parameters- My board is going to work at 3.3V- It's battery powered board so I need low power consumption- It Doesn't important that size of IC and communication interface- Measurement range must be -40°C ~ 125°CTMP75-Q1https://www.digikey.com/product-detail/en/texas-instruments/TMP75CQDRQ1/296-45270-1-ND/6597314TC1046http://ww1.microchip.com/downloads/en/DeviceDoc/21498D.pdfLMT70https://www.digikey.com/product-detail/en/texas-instruments/LMT70YFQT/296-42088-1-ND/5252841TMP102http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=tmp102&fileType=pdfDS1820https://datasheets.maximintegrated.com/en/ds/DS18B20.pdfMCP9808http://ww1.microchip.com/downloads/en/DeviceDoc/25095A.pdfthanks

author: BagOfSpanners
author_rank: Newbie
timestamp: April 05, 2017, 11:48:55 am
content: I have 4 DS18B20 sensors attached to a Raspberry Pi measuring various temperatures between -5°C and + 75°C all day, no failures so far. I ran them side-by-side on a desk for a few hours, and they all ended up reading within about 0.1°C of each other. I bought a bag of 10 from Amazon with leads already attached, still trying to think of a use for the other 6.

author: danadak
author_rank: Super Contributor
timestamp: April 05, 2017, 12:41:45 pm
content: On the low power aspect, consider putting system to sleep aftermeasurements are taken. Even power down the sensor, but considerthe thermal time constants of sensing path before taking anothermeasurement.Regards, Dana.

author: nctnico
author_rank: Super Contributor
timestamp: April 05, 2017, 04:44:33 pm
content: Accuracy?I've seen failures and problems with Microchip temperature sensor chips so I'm not using those again. Nowadays I mostly use NTCs and an approximation using a lookup table.

author: HoracioDos
author_rank: Frequent Contributor
timestamp: April 05, 2017, 04:46:22 pm
content: I think you might consider these aspects like pros and consPower ConsumptionAccuracyInterface (SPI, I2C, 1Wire)Sampling rateI like Bosch sensors very much. They are very accurate and fast.

author: danmcb
author_rank: Regular Contributor
timestamp: April 05, 2017, 05:53:31 pm
content: microchip also have one called TC77 which is again SPI - I have one on a dev board from them. I hope it turns out to be better than someone here has had as I am designing it into something right now ... !

author: james_s
author_rank: Super Contributor
timestamp: April 05, 2017, 06:26:09 pm
content: The DS1820 is a very common sensor that is widely supported, it ought to do what you need. In a pinch the good old 10k NTC thermistor connected to an ADC input still works fine too.

author: rneraslan
author_rank: Contributor
timestamp: April 05, 2017, 06:39:41 pm
content: Quote from: HoracioDos on April 05, 2017, 04:46:22 pmcan you give me an example of bosch sensor?

author: james_s
author_rank: Super Contributor
timestamp: April 05, 2017, 06:44:21 pm
content: The BMP180 is a popular Bosch temperature/barometric pressure sensor. If you don't need the baro feature it might not make sense to use though.

author: HoracioDos
author_rank: Frequent Contributor
timestamp: April 05, 2017, 07:05:54 pm
content: Quote from: james_s on April 05, 2017, 06:44:21 pmYou are right and it doesn't meet the requeriments -40°C ~ 85°C

author: HoracioDos
author_rank: Frequent Contributor
timestamp: April 05, 2017, 07:10:09 pm
content: Quote from: rneraslan on April 05, 2017, 06:39:41 pmhttps://www.bosch-sensortec.com/bst/products/all_products/bme280I didn't check if the sensor could meet the temperature range. I'm sorry, My mistake!!