I am searching a Micro QR Code Generator that fulfills the following requirements:

• At least 20 characters encoded
• Minimal error correction (required to get the 20 characters stuffed in)

I already searched google, but it seems all micro qr generators automatically use maximum error correction, which is very unhandy for my task, as we need the 20 characters completety.

I can't use standard QR because there are certain requirements that need the code to be smaller than a certain dimension when printed...

I hope someone can help me.

PS: I'm not sure that this is the right board to post this question on, so feel free to redirect me to a better board if you have an idea.

PPS: If nothing can be found and I'm forced to write one on my own: Where can I find detailed information on how to write a QR code generator?