Decent Accuracy Temp&Humidity Sensors?

[NotYetRated]

Been about 6-8 months since I have been active here, busy with other house work and such.

Looking to update/make new sensors, was looking at the Senseboard and its integrated Si7021, I like the accuracy range it provides. Are people using these on their boards? I don't have much use right now for battery powered, are there any other options for low cost, good precision temperature and humidity? I don't like the cost of the DS22's at like 6+ bucks a pop. Are the Si a better choice? Just looking for cost effective, high accuracy.

[Dwalt]

@NotYetRated On eBay, the si7021 and dht22 are about the same cost ~ $3.25 - $3.50 USD. The si7021 are better for low or battery power @ 1.9 - 3.6V while the dht22 range is 3.3 - 5.5V. The si7021 is also much smaller package @ 3x3mm.

[ahhk]

Also take a look at HTU21D....

[emc2]

I was wondering in an other post if anyone had some experience (accuracy, easy to use etc) with BME280 (tep/hum and baro) http://www.ebay.com/itm/401000227934

Mine is still on the way but hopefully will see in a few weeks.

[robosensor]

I'm using BME280 (from aliexpress), very good and accurate sensor. But sensor price is not comfortable for me.

Easy to use (I'm using adafruit bme280 libraries with MySensors).

[emc2]

Good to know it's accurate.

I agree the price is still a little steep and I would not put this one everywhere. But for a weather station project it's nice to have everything in one sensor.

[ahhk]

@robosensor: What about power consumption, max/min voltage and measuring time?

Greetings

Andreas

[robosensor]

@ahhk https://www.bosch-sensortec.com/de/homepage/products_3/environmental_sensors_1/bme280/bme280_1

Average current consumption (1Hz data refresh rate)
1.8 μA @ 1 Hz (H, T)
2.8 μA @ 1 Hz (P, T)
3.6 μA @ 1 Hz (H, P, T)
H - humidity, P - pressure, T - temperature

0.1 μA in sleep mode

Supply voltage 1.71 - 3.6 V

[ahhk]

very NICE

[Toyman]

@robosensor said:

@ahhk https://www.bosch-sensortec.com/de/homepage/products_3/environmental_sensors_1/bme280/bme280_1

Average current consumption (1Hz data refresh rate)
1.8 μA @ 1 Hz (H, T)
2.8 μA @ 1 Hz (P, T)
3.6 μA @ 1 Hz (H, P, T)
H - humidity, P - pressure, T - temperature

0.1 μA in sleep mode

Supply voltage 1.71 - 3.6 V

I also failed into this trap in fact, bme280 consumption in NORMAL mode is 450-600ua