# TTN meets RIVM. or: how to-make your own lora air quality sensor

**URL:** <https://www.thethingsnetwork.org/forum/t/ttn-meets-rivm-or-how-to-make-your-own-lora-air-quality-sensor/5162>\
**Category:** End Devices (Nodes)\
**Created:** [February 1, 2017, 7:08pm UTC](https://www.thethingsnetwork.org/forum/t/ttn-meets-rivm-or-how-to-make-your-own-lora-air-quality-sensor/5162 "2017-02-01T19:08:36Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![Bergrans](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/bergrans/32/7283_2.png) [@Bergrans](https://www.thethingsnetwork.org/forum/u/Bergrans)\
**Post date:** [February 6, 2017, 9:52pm UTC](https://www.thethingsnetwork.org/forum/t/ttn-meets-rivm-or-how-to-make-your-own-lora-air-quality-sensor/5162/12 "2017-02-06T21:52:13Z")

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HI TijnOnlijn

I think the schematics can be simplified be replacing the level shifters with just a simple (two resistor) voltage divider. The pulses from the sensor are relatively slow (5ms to 100ms) so a simple 2k2 + 3k9 divider should work just fine.

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