# Door lock with password pin

**URL:** <https://discourse.nodered.org/t/door-lock-with-password-pin/27008>\
**Category:** Dashboard\
**Created:** [21 May 2020 00:28 UTC](https://discourse.nodered.org/t/door-lock-with-password-pin/27008 "2020-05-21T00:28:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![thalesmaoa](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/thalesmaoa/32/17067_2.png) [@thalesmaoa](https://discourse.nodered.org/u/thalesmaoa)\
**Post date:** [21 May 2020 00:28 UTC](https://discourse.nodered.org/t/door-lock-with-password-pin/27008/1 "2020-05-21T00:28:52Z")

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There are a lot of solutions regarding this topic, but I couldn’t find any specific using nodered and mqqt server.

I’ve implemented a door lock in my house with two rfid. One internal and other external. I also took out the padlock. The only way to open it is using a 12V over the coil.

For that I used an Arduino Uno, which I decided to upgrade to an ESP32 using MicroPython. From time to time, Arduino Uno freezes due Software Serial. ESP32 has 3 UART ports, which I hope can increase reliability.

Since it already has WiFi, I did a simple subscribe and a button to open the door as well. Get in and out with the smartphone. Unfortunately, that’s not safe at all. Mainly because of my kids.

My goal is to implement a field where you must feel a 6 digit pin and submit.  
Esp32 check the pin and decide if open or not.

What do you suggest, as simple and direct solution for that?

I was just considering using form, but I still need to learn about How nodered deal with POST and so on. In other words, I need to be sure which is the best solution to guide the efforts for.

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**Author:** ![thalesmaoa](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/thalesmaoa/32/17067_2.png) [@thalesmaoa](https://discourse.nodered.org/u/thalesmaoa)\
**Post date:** [22 May 2020 04:10 UTC](https://discourse.nodered.org/t/door-lock-with-password-pin/27008/2 "2020-05-22T04:10:25Z")

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I'm now using form with number type. When I open my smartphone, it open the number pad only. Great! However, how do I limit the number of characters and hash the password?

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [21 June 2020 04:10 UTC](https://discourse.nodered.org/t/door-lock-with-password-pin/27008/3 "2020-06-21T04:10:27Z")

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