# How to start? App for 868.35MHz sensors **URL:** \ **Category:** Questions & Help\ **Created:** [September 1, 2018, 6:27am UTC](https://community.homey.app/t/how-to-start-app-for-868-35mhz-sensors/976 "2018-09-01T06:27:27Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![FKey](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/fkey/32/14793_2.png) [@FKey](https://community.homey.app/u/FKey)\ **Post date:** [September 1, 2018, 6:27am UTC](https://community.homey.app/t/how-to-start-app-for-868-35mhz-sensors/976/1 "2018-09-01T06:27:27Z")
One of my homey challenges is to catch the signals from my alarm system. (Its an older system without smart interface) Every room in the house has a wireless sensor, would be great if I could use these for presence detection. I searched for an app that could read the sensors but did not find one. So the challenge is to create one myself (with a little help) have no idea how to start and do not have a lot of software skills… My sensors are 1way sensors 868.35MHz. (Examples:[https://www.pahedomotica.nl/product-categorie/alarmsystemen/accessoires-prime-proguard800/](https://www.pahedomotica.nl/product-categorie/alarmsystemen/accessoires-prime-proguard800/)) So the interface is probably simple: identifier for the unit & on/off signal. There could be 2 ways to go: 1 Read the RF signal that is send by the sensor (how?) and build an app that monitors for that signal. (Trigger a sensor, catch the signal, use that) 2 figure out the the RF coding and build an app around that. Suggestions on how to start are welcome 🙂 (Or maybe I missed an app thet excist) Greetings Frank ---
**Author:** ![Jojje](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jojje/32/8681_2.png) [@Jojje](https://community.homey.app/u/Jojje)\ **Post date:** [September 1, 2018, 4:40pm UTC](https://community.homey.app/t/how-to-start-app-for-868-35mhz-sensors/976/2 "2018-09-01T16:40:45Z")
Hi, I found a guy who hacked a 433 system… Perhaps you could use this technic for hacking your system in some way… I hope it helps… ---
**Author:** ![JPe4619](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jpe4619/32/9017_2.png) [@JPe4619](https://community.homey.app/u/JPe4619)\ **Post date:** [September 1, 2018, 8:25pm UTC](https://community.homey.app/t/how-to-start-app-for-868-35mhz-sensors/976/3 "2018-09-01T20:25:37Z")
> **[harriedegroot/Athom-Homey-RF-Signal-Analyzer](https://github.com/harriedegroot/Athom-Homey-RF-Signal-Analyzer)** > > Athom Homey RF Signal Analyzer. Contribute to harriedegroot/Athom-Homey-RF-Signal-Analyzer development by creating an account on GitHub. > **[Generic 'Add 433Mhz device' functionality (for my Chacon doorbel) - Page 2](https://forum.athom.com/discussion/1262/generic-add-433mhz-device-functionality-for-my-chacon-doorbel/p2)** > > Has Athom already developed a 433 sniffer for Homey? I have a Renkforce (Conrad) Klikaan / klikuit system, a Elro and Alecto system. [https://developer.athom.com/docs/apps/index.html](https://developer.athom.com/docs/apps/index.html) Stuff you can read to inform you what you ca do with Homey. It’s also about 868MHz ---
**Author:** ![Dijker](https://avatars.discourse-cdn.com/v4/letter/d/b9bd4f/32.png) [@Dijker](https://community.homey.app/u/Dijker)\ **Post date:** [September 1, 2018, 8:57pm UTC](https://community.homey.app/t/how-to-start-app-for-868-35mhz-sensors/976/4 "2018-09-01T20:57:25Z")
The video from @Jojje is absolute educational how to use en 10 $ DVB-T USB stick on an Raspberry Pi. But it will not help you in how to capture the signal the way Homey Analyzes it. The Links from @JPe4619 from Athom and the GitHub from @HarriedeGroot are absolute the way you should investigate the signal to build your Apps on Homey. Just in 5 minutes to capture a signal and analyze it with the Athom-Homey-RF-Signal-Analyzer to verify my by hand made signal what cost me a lot of time (some evenings) last year I created my first basic 433 App. ---
**Author:** ![HarriedeGroot](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/harriedegroot/32/56160_2.png) [@HarriedeGroot](https://community.homey.app/u/HarriedeGroot)\ **Post date:** [September 1, 2018, 10:09pm UTC](https://community.homey.app/t/how-to-start-app-for-868-35mhz-sensors/976/5 "2018-09-01T22:09:41Z")
If you’ve got any problem using the tool, please let me know. All suggestions for improvements are welcome. ---
**Author:** ![Jone\_Lura](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jone_lura/32/16576_2.png) [@Jone\_Lura](https://community.homey.app/u/Jone_Lura)\ **Post date:** [March 19, 2020, 1:02pm UTC](https://community.homey.app/t/how-to-start-app-for-868-35mhz-sensors/976/6 "2020-03-19T13:02:09Z")
Hi! Im not sure if I have managed to connect successfully. I used the public IP and added the besrer token. I pushed the button while listening, but could not see any results anywhere. Im trying to listen for the Honeywell doorbell signals Best regards, Jone