4 channel Blynk Board with DHT 11

[saurabh47]

Hello Guys,
I have made an board by using this board we can control up to 4 Appliances via Relays & also we can monitor room temperature & Humidity via DHT 11.

DIY Home Automation using Wemos D1|| ESP 8266 & Blynk App|| 4 channel Relay

Home Automation Under 15$

Previously, I had made same board by a manual etching process

4 channel Blynk Board

Hello, Guys This is my college project. In this project, we have made 4 channel Relay board with built-in wemos D1 Mini as controller.we have made this PCB layout in EDA online pcb design tool. It is really easy to use.We have made this PCB by the manual etching process. Many thanks to @Costas for helping me.& as all always many thanks to Blynk team for making Amazing Platform. You can access my project here & you can also make changes to it. [image] [Screenshot_2017-10-01-01-01-14-600]! […

[Pavel]

Very cool! Thanks for sharing

[wanek]

nice video, good work!

next time use “copper pour” for gnd plane, it is good for the circuit and also for the environment - it produces less toxic waste, and the boards look more professional

also, try diptrace pcb design software, it is very user friendly and completely free!

[Gunner]

@saurabh47 Nice!!.. I like how you showed, step by step, the App project setup. Much more beneficial for learning then posting a simple QR

[saurabh47]

Thank you so much to everyone.

@wanek

next time use “copper pour” for gnd plane, it is good for the circuit and also for the environment - it produces less toxic waste, and the boards look more professional

Can you explain in detail How to use “copper pour” for gnd plane,?
I will take care of it.

[Gunner]

@saurabh47

How to use “copper pour” for gnd plane,?

Copper pour is when the unused copper plating is left on the board. Your PCB layout program may have an option to do that.

Copper pour

[wanek]

i would, but i’m not familiar with the design software you use. you should google it.

[PeteKnight]

I’ve always thought that using copper pour in the area where you have an ESP dev board mounted will reduce the effectiveness of the onboard antenna.

Pete.

[PeteKnight]

Also, it’s not clear how large the tracks are that handle the mains power, or how much physical separation there is between them and the low voltage connections to the relay. If you take a look at some similar boards such as the Sonoffyou’ll see that additional so,Der is flowed over the mains tracks (which are already quite wide) to beef them up, and parts of the circuit board are routed out to provide an air gap between the HT and LT sides. hT tracking across the surface of the circuit board can be an issue in high humidity or dusty environments.

Pete.

[Costas]

@PeteKnight

hT tracking across the surface of the circuit board can be an issue in high humidity or dusty environments.

Like in @saurabh47’s environment.

[gab.lau]

@PeteKnight

Also, it’s not clear how large the tracks are that handle the mains power, or how much physical separation there is between them and the low voltage connections to the relay.

The tracks is 1mm large, so no enouth power, for 2oz of thickness only 4A.

[wanek]

true. but in all programs it is possible to delimit the copper pour area. or, it is even better if the esp board is mounted so in the pcb to poke out the antenna part.

regarding the required trace clearence and width for high voltage / current, there are concrete tables and calculators on the net, so this can be designed properly.

there is a quite good free pcb design tutorial, by dave jones (that crazy austral guy). it is a bit outdated on some aspects, but it is a great starting point. i’m on phone now, i will try to find the link.

here it is:
http://alternatezone.com/electronics/pcbdesign.htm