Updated 4th December – The postman has been busy while I’ve been away on business. My ESP-03 arrived yesterday – I’ve made a sketch of the pin-out – and this morning I had a go at installing the LUA interpreter which just had an update late yesterday.
Meanwhile, a somewhat larger parcel arrived. Some time ago I entered a competition and won a DFROBOT Arduino board with Bluetooth – I have to say it looks very pretty but basically it’s an Arduino with Bluetooth and some drivers – I could not see any great merit and now it’s on Ebay.
The diagram to the left is correct as far as I can tell. It’s usual 3v3 to VCC, CH_PD to VCC and ground the GPIO0 line to program –
but in addition it seems you need to hold GPIO15 to ground in both modes. I’ve programmed up the ESP-03 and it operates pretty much as you’d expect from the other devices such as the ESP-01 – but of course – you have extra pins to play with.