Schematic design feedback and ERC questions!

[renegadeandy]

Hi all,

I want to create a schematic for the following behaviour:

I want an ESP-12e (ESP8266) microcontroller similar to an arduino, to be able to control 10 RGB leds , changing their colours from blue to green to red and all shades available in between those colours.

I have designed the following schematic to achieve this behaviour having researched options:

You may notice that I have 4 erb check failures here - which are all associated with the power sources, I am not sure what I have done wrong here, any suggestions would be appreciated.

Another question I have as per the schematic note is - which 9V regulator would I use , given I need around 600mA from it I am finding it hard to find one within the schematic libraries and additionally, finding an actual regulator to buy appears difficult.

Any feedback on the schematic in terms of design and fit for purpose would be great. In general I have a question about the design and that is as follows: As I understand it, I can control the amount of brightness of Red, Green and Blue from my LED by controlling the amount of voltage sent to those pins, however, the 2N2222 is on, or off - with no space in between, so does that mean in this case as my GPIO pins fluctuate to control shades of colours, the LEDS in this case will be Red ON or OFF, Green ON or OFF and Blue ON or OFF - or have I misunderstood how this bit works.

Many thanks!

[paulvdh]

Re-read your own thread from 2018:

ERC Checker problems with power line

Hi, I am designing the schematic for a board and have a single remaining error in the ERC Checker. Please can you take a look and help me understand what the problem is. I have 4 identical scart bus connectors, each driven from a 5V rail, see here: [41] Pin 17 is the 5v Rail connector, and in each of the 4 chips, it is connected to the same rail, as per this image(note the right angled wire on the right hand side is the wire from A4 pin 17: [02] The ERC checker reports just 1 single error: …

[renegadeandy]

Thanks – got that now I knew I had seen this problem before.

Can you take a go at my other questions?

[kenyapcomau]

7809 is a well-known 9V 1A voltage regulator in TO220 package. Surely you are not relying on Kicad libraries for design info? Choose your component based on datasheets, then assign it the right symbol and footprint (or make them if necessary).

To control the colour you need to control the average current through each LED. Since your transistors are on or off you’ll have to use pulse width modulation. Search for that term.