# The WORKBENCH part 3

**URL:** <https://www.thethingsnetwork.org/forum/t/the-workbench-part-3/21125>\
**Category:** Hardware\
**Created:** [January 1, 2019, 3:01pm UTC](https://www.thethingsnetwork.org/forum/t/the-workbench-part-3/21125 "2019-01-01T15:01:16Z")\
**Posts on this page:** 1\
**Showing post:** 37

<div class="post-metadata">

**Author:** ![BoRRoZ](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/borroz/32/44234_2.png) [@BoRRoZ](https://www.thethingsnetwork.org/forum/u/BoRRoZ)\
**Post date:** [January 11, 2019, 1:11pm UTC](https://www.thethingsnetwork.org/forum/t/the-workbench-part-3/21125/37 "2019-01-11T13:11:52Z")

</div>

![x1218](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/6/9/698d3f2b9fc959db902bb404ebf0ea90cb9d6aba.jpeg)

wasted a few hours ‘bughunting’ … I just forgot to use pull up resistors on the I2C bus 🙄

short explanation idea/experiment :

_this (allready joined @home) mobile device transmits, after the push of a button, 3 single bytes packets (with some interval time)_  
_1 on SF 7_  
_1 on SF 9_  
_1 on SF 12_

_@home I will have a dedicated RPI with an application that responds when received one (or more) of these packets._  
_The device responds by sending then it’s location from GPS (when there’s a sat lock)_

_The application receives the coordinates and calculates the distance(s) between the gateway(s) that received the signal and the device location._  
_The application (mini server) sends the calculated distance / RSSI / SNR back to the device where its displayed._

so basically its a handheld mapper 🕶 _without the need of a phone_ **when** it works I can think of ‘automatic / continue modes’ nice thing is that the data is immediate available @home

with some fantasy , a faster processor/more memory and a programmable attenuator/compass you can use it to find gateways ? 😏

- [https://geopy.readthedocs.io/en/stable/#module-geopy.distance](https://geopy.readthedocs.io/en/stable/#module-geopy.distance)
- [https://nathanrooy.github.io/posts/2016-09-07/haversine-with-python/](https://nathanrooy.github.io/posts/2016-09-07/haversine-with-python/)
- [https://pypi.org/project/geopy/](https://pypi.org/project/geopy/)

---

_[View the full topic](https://www.thethingsnetwork.org/forum/t/the-workbench-part-3/21125)._