Ronald Knerr asked 4 years ago
Hello!
I recently purchased your book “Home Automation with ESP8266” and I am currently going through the lessons. I’ve noticed that the schematics in the book for the each set up doesn’t give any details. In particular, I’m really lost without the resistor numbers. I never know when to use a 10k or a 220. Is there any way you can clear this up? I can’t follow along any further. I’ve done the ones that I know (like for an LED), but for the most part I’m lost.
Thank you for your time.
Ron.
Sara Santos Staff answered 4 years ago
Hi Ron.
I’m sorry for the confusion.
The schematic diagrams present the resistors with their colors. The color indicates the resistor value.
You can search for a resistor color code to figure out the value from the color. Here’s an example: https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code
But, yes, you are right, we should have made it more clear in the eBook.
Usually, these are the values that we use:
- LEDs: 220Ohm (red/red/brown/gold)
- Pushbuttons: 10kOhms (brown/black/orange/gold)
- DHT: 10k or 4.7k Ohms (yellow/purple/red/gold)
I hope this is clear.
If you have any doubts about some diagram, just ask.
Regards,
Sara
Ronald Knerr answered 4 years ago
Hello Sara.
I had heard your customer support was awesome, and your quick response shows it.
Thank you for the info. I’m really new to this hobby do my “resistor reading” isn’t that good. Given what you told me, though, I should be able to figure it out.
I appreciate you responding to my ignorant questions and thank you again for taking the time.
Regards,
Ron.
Sara Santos Staff answered 4 years ago
Hi.
Thanks.
Don’t worry about that.
I’ll mark this issue as resolved.
If you need further help, or if you’re confused about some diagram or any other topic, just ask.
Regards,
Sara