Ultimate Bike Computer From an Old Smartphone

turn your old android smartphone into the ultimate bike computer.

Materials

1. android smartphone.
2. a way to mount it to your ride.
WiFi connection for setup and map download

software required.
digihub speedometer (available in Google play store)
Google maps. make sure it is up to date.
flashlight app.

Bike Mount.

I got this out of my junk box but they are easily found for a dollar at most thrift stores or garage sales.
it is a basic clamping mount for a smartphone. secure it well and make sure it holds the phone tight.

Download Digihub Speedometer.

get it at the play store.

this app is accurate and has lots of customization (color, units, etc)
also has an odometer and trip settings.

Download Offline Maps of Your Area.

Open Google Maps.
Click offline maps.
Select the region you want to save in the phone and download.

Set Your Screen to a Long Timeout

Go to your phone settings and set the screen timeout to maximum.
You can also go to developer options and set it to never turn off (until you manually press power to turn screen off)

Setup the Overlay.

In digihub tap the screen for the menu bar and select window mode. This will make a widget for your speedometer so you can see it over the top of the maps app.

Open Maps.

There it is. you have GPS maps of your riding area and a speedometer. You can drag the speedometer anywhere you want on the screen and resize it to your needs.

Other Improvements and Flashlight App.

The flashlight app is for if your batteries die on your bike light.

I will reserve this step to add on cool features as I find them.