Wemos D1 not booting
Posted: Sat Aug 12, 2017 12:59 pmI’ve been really struggling with a WEMOS D1 Mini. When I power it with regulated 5v it doesn’t boot until you press reset.
I’ve pulled up every GPIO+RST except GPIO15 which is directly grounded.
When I power it up and test voltage, GPIO0 shows 1.6v (presumably low?!) whereas GPIO2 (next to it) shows 3.3v. These are pulled up using 4k7 resistors off the 5v line. I tried off the 3.3v previously, same result.
Here are a couple of photos - this is my second attempt to get this board working, and I’ve tried many, many suggestions I’ve read online.
You will see 2 regulators and a big cap next to one of them - these 2 parts are not currently used. I intended this to provide a separate 5v to power the LCD, just in case it was a power issue.
I do have caps on the 5v and 3.3v lines.
I’ve tried two different Wemos D1 Pro boards. I’ve also painstakingly recreated the circuit twice with the same results.
I was previously using an ESPDuino with a screw shield, and near identical circuitry - that one always boots despite identical connections to the same pins.
Very stuck!! Any help would be much appreciated.
I’ve pulled up every GPIO+RST except GPIO15 which is directly grounded.
When I power it up and test voltage, GPIO0 shows 1.6v (presumably low?!) whereas GPIO2 (next to it) shows 3.3v. These are pulled up using 4k7 resistors off the 5v line. I tried off the 3.3v previously, same result.
Here are a couple of photos - this is my second attempt to get this board working, and I’ve tried many, many suggestions I’ve read online.
You will see 2 regulators and a big cap next to one of them - these 2 parts are not currently used. I intended this to provide a separate 5v to power the LCD, just in case it was a power issue.
I do have caps on the 5v and 3.3v lines.
I’ve tried two different Wemos D1 Pro boards. I’ve also painstakingly recreated the circuit twice with the same results.
I was previously using an ESPDuino with a screw shield, and near identical circuitry - that one always boots despite identical connections to the same pins.
Very stuck!! Any help would be much appreciated.