I don’t believe you. There’s a big difference between an idiot and somebody who’s prepared to learn, and as a chemist, my money’s on you’re the latter.
Is it possible to connect the emonPi into your LAN using an Ethernet cable? If you can, you should be able to use emonCMS to reset the WiFi. My notes say:
Reset / reconnect emonPi to a different network: To force an EmonPi back into AP mode, go into ‘WiFi’ from settings and deselect the currently selected WLAN. Click on save and then refresh. You will still have access to the emoncms instance. Navigate to the admin menu and click reboot. The EmonPi will now come up in AP mode (as no network is configured).
Force the Emonpi to AP-mode - #4 by borpin
Alternatively, if you’re happy editing on your Mac, do a controlled shutdown of your Pi (i.e via the pushbutton menu) and put the SD card in your laptop. You should see 3 partitions: 11GB Volume, bootfs & rootfs. In rootfs, navigate to /etc/wpa_supplicant/wpa_supplicant.conf and open it in a text editor. (You might need super privileges to edit the file.)
Mine looks like this:
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=GB
network={
ssid="MyNetwork"
psk="MyWirelessPassword"
}
Replace MyNetwork and MyPassword (in double quotes) with your Network’s name & password (off the label on your router?) save the file and put the card back in your Pi, and it should appear on your network. When you can see it on your router’s control panel, it’s a good idea to make its address static, so that it will remain the same always, and not be assigned a new address if your router reboots.