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Cool project! Great integration of GPS and compass. Would be even cooler if the desired GPS co-ordinates of where the geocache is can be entered. Maybe one digit at a time using 7-segment display and switch.
Access Control With Arduino + Keypad 4x4 + Servo (UPDATE)
Seems like the roger app is removed from iPhone App Store
Make sure Alexa and LinkNode are on the same wifi network. On the Alexa app, go into smart home and discover. Are you sure the upload was fully successful ? You would see progress bar when it uploads and blue LED on the ESP8266 board will blink. I had some difficulty getting the upload to work - sometime I have to reset the power to the board before the upload will work. I was able to get two boards working. Make sure to get the code from Charles's github.
I think Nitin's question is if it is possible to use the LinkNode R4 without Alexa. I made this one and it's great to be able to use it with Alexa but it seems you can only use it with Alexa. There is no "secondary" method to control the lights. It would be great if we can connect to the same node thru a webpage or similar method as well. Would that be possible ?
Here's my setup during programming and then installed in the wall. I am using the board to control two 3-way devices and one fan (one way). It works great. The advantage of 3-way switching is that I can use wall switches if Alexa fails for any reason.
DIY Home Automation With ESP8266 (Linknode R4) and Amazon Alexa
Raspberry Pi Class
Project-Based Engineering for Kids
$4 WiFi Door Alarm using a ESP8266 #IoT
Easy Electric Bike Conversion Kit Installation
How to Make a Fan POV Display
How to Make a Raspberry Pi Media Panel (fka Digital Photo Frame)
Speech Recognition with Arduino
An Arduino RSS Feed Display
Geo Data Logger: Arduino+GPS+SD+Accelerometer to log, time-stamp, and geo-tag sensor data