I am looking for a temperature and humidity sensor
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I am looking for a temperature and humidity sensor that I can connect to the Wipy/Lopy. It should be very small so that it fits in a small round case and is not bigger than 6-8 mm with case. Something like the DS18B20 only with additional humidity sensor. Could you possibly also take the BME 280 with I2C interface and remove the sensor, solder it to a 1 meter cable and then solder it back to the I2C interface?
Maybe someone can help, I would be very happy.Translated with www.DeepL.com/Translator
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@robert-hh
Okay, thanks for your help.
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@wolli01 You can connect this device directly to the LoPy. I think I purchased the same or similar one. If you need a driver, you may take this one: https://github.com/robert-hh/BME280. It works with the Pycom devices.
The humidity sensor may take a few days or even weeks to settle. Temperature an pressure should be precise within specs.
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https://www.amazon.de/AZDelivery-GY-BME280-Barometrischer-Temperatur-Luftfeuchtigkeit/dp/B07D8T4HP6/ref=sr_1_1_sspa?__mk_de_DE=ÅMÅŽÕÑ&keywords=bme280&qid=1552231206&s=gateway&sr=8-1-spons&psc=1
I have this sensor. Can I connect it directly to the Lopy or do I have to use a resistor between?
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@wolli01 The sensor chips itself, like BME280, BME680 or SI7021 are very small, like 3x3 mm for the BME680 and SI7021, 2.5x2.5mm bme280. The prices for the bare chip range from about 3€ (SI7021) to about 12 € (BME680). The interface requirements are also not very critical. Soldering wires directly to the chip is possible, but requires a microscope and a steady hand. If you take an existing module, then you will most likely break the sensor in the attempt to remove if from the PCM. So you will need a separate sensor chip too. But then you can set-up the interface yourself. When connecting to a PyCom module, the only additional components you need are buffering capacitors for Vcc and pull-up resistors for SDA and SCL.
