Step 5: Connect Your Supply/device and Monitor. Now simply connect your power supply/battery to the input jack and your device to the output jack. Connect the D1 mini using a micro-usb cable for power and flick the switch to power your device. Load the Blynk app and you can now monitor the device's voltage and power supply.
Make sure the pins are aligned correctly when you put the Wemos into the board. It is fairly easy to get them off one pin and not see it. This uses only +5v and ground for power, if these are good you should see the red led no matter what. Test the 5v and ground pin with a multimeter with the board in and powered up.
I think a 500mA VReg will be OK if all you are powering is the Wemos D1 Mini and no other accessories. But to reduce the chance of power brownouts during random peak currents, I suggest adding a 330uF to 470uF 10V low ESR electrolytic directly on the D1 mini's 5V power pin. Short leads to 5V and Gnd (installed on D1 Mini not the PSU).
Step 4: Configure and Upload the Arduino Code. Download the Arduino sketch and open in the Arduino IDE. Ensure that the ESP8266Wifi libraries are installed. Update the sketch with your own WiFi SSID, password and IFTTT key retrieved in the previous section. Ensure that the D1 mini is selected under the tools menu and attach the Push Button to WEMOS latest Boards: D1; D1 mini Shields D1 Mini Shields Power Shields ¶ Battery: DC Power In this tutorial we will demonstrate how to setup and program the WEMOS D1 mini and an ESP8266 with the Arduino IDE to display your data with Ubidots. Requirements. Wemos D1 Mini, D1 mini Pro, D1 mini Lite; Arduino IDE 1.8.2 or higher; Ubidots library; Ubidots account-or- STEM License; Step 1. Setup WEMOS D1 Mini using the Arduino IDEA solution was to put code in the ota: section of the YAML to turn the lamp off when OTA begins. ota: on_begin: then: - light.turn_off: id: the_light transition_length: 0s. I removed the ESPhome node from the energy meter circuit and connected directly to my laptop and the firmware updates over OTA is successful.Modifying the Wemos D1 Mini Pro To Use The External Antenna: One of the main benefits of the D1 Mini Pro is that you can attach an external WiFi antenna for greater range. This is an optional feature, and it does require some resoldering to reroute the antenna signal from the built-in ceramic antenna to the external socket. YNaX18.