# Hi, I have a question about how to activate flows with NFC Cards **URL:** \ **Category:** Questions & Help\ **Created:** [April 10, 2021, 5:41pm UTC](https://community.homey.app/t/hi-i-have-a-question-about-how-to-activate-flows-with-nfc-cards/46048 "2021-04-10T17:41:06Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Math\_Deguelle](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/math_deguelle/32/34092_2.png) [@Math\_Deguelle](https://community.homey.app/u/Math_Deguelle)\ **Post date:** [April 10, 2021, 5:41pm UTC](https://community.homey.app/t/hi-i-have-a-question-about-how-to-activate-flows-with-nfc-cards/46048/1 "2021-04-10T17:41:06Z")
I have build a NFC reader based on NodeMcu and connected to Homey with the app Homeyduino. With the Ardino IDE I can read the NFC card ID’s via the serial monitor. In Homey I can trigger flows when I use the if card “RFID - All Triggers” This works for all NFC cards I have. ---
**Author:** ![Math\_Deguelle](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/math_deguelle/32/34092_2.png) [@Math\_Deguelle](https://community.homey.app/u/Math_Deguelle)\ **Post date:** [April 10, 2021, 6:59pm UTC](https://community.homey.app/t/hi-i-have-a-question-about-how-to-activate-flows-with-nfc-cards/46048/3 "2021-04-10T18:59:07Z")
Hi Roy, Thanks. I have tried this already but no results. I have tried to give a value to “voorwaarde” but not any value is accepted. When I leave this item blank and I save this flow I’ve got the error message “ontbrekend argument autocomplete in RFID – Thuis” ![image001.png](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/4/1/41dd47bde643fca507759fb83eb547cc5447d4ba.png) ---
**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:** [April 10, 2021, 11:06pm UTC](https://community.homey.app/t/hi-i-have-a-question-about-how-to-activate-flows-with-nfc-cards/46048/4 "2021-04-10T23:06:39Z")
How does your Homey know that your device is reading RFID cards? ---
**Author:** ![Math\_Deguelle](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/math_deguelle/32/34092_2.png) [@Math\_Deguelle](https://community.homey.app/u/Math_Deguelle)\ **Post date:** [April 11, 2021, 2:55pm UTC](https://community.homey.app/t/hi-i-have-a-question-about-how-to-activate-flows-with-nfc-cards/46048/6 "2021-04-11T14:55:23Z")
The general trigger when a nfc is detected works fine and the flow action is correctly performed. But when I want to trigger with a NFC specific code ( in my case code 23259416) it doesn’t work. Probably I do something wrong but I don’t know what. ---
**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:** [April 11, 2021, 3:21pm UTC](https://community.homey.app/t/hi-i-have-a-question-about-how-to-activate-flows-with-nfc-cards/46048/7 "2021-04-11T15:21:54Z")
Copy the read-out-data to your TimeLine with a logic-card, maybe you can see some more digits or other characters you need to use. ---
**Author:** ![Math\_Deguelle](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/math_deguelle/32/34092_2.png) [@Math\_Deguelle](https://community.homey.app/u/Math_Deguelle)\ **Post date:** [April 11, 2021, 4:14pm UTC](https://community.homey.app/t/hi-i-have-a-question-about-how-to-activate-flows-with-nfc-cards/46048/8 "2021-04-11T16:14:33Z")
Hi Jan and Roy, Thanks for your information. My flow is now working ok. When I read my cards the information is put in the variable “waarde”. This variable “waarde” can I use in the “if” card ![image001.png](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/2/6/26003a0ceaa48c71f4cfc511276bd0f656f2a695.png) ---
**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:** [April 11, 2021, 4:19pm UTC](https://community.homey.app/t/hi-i-have-a-question-about-how-to-activate-flows-with-nfc-cards/46048/9 "2021-04-11T16:19:09Z")
Sorry, not Logic, Use this card ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/4/6/463a6877a0b2177ffae614ea73c6651136f1f69a.png) ---
**Author:** ![tlangelaar](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/tlangelaar/32/10980_2.png) [@tlangelaar](https://community.homey.app/u/tlangelaar)\ **Post date:** [April 11, 2021, 8:52pm UTC](https://community.homey.app/t/hi-i-have-a-question-about-how-to-activate-flows-with-nfc-cards/46048/10 "2021-04-11T20:52:15Z")
Indeed use some outdoor lime timeline to detect the format of the output. Homey NFC uses the colon : separators in its values.