Telemetry (Live Data)

One of the benefits of using a smartphone to log the data is it’s internet connection. With the exception of some tracks with poor signal, this provides an excellent opportunity to get the logged data back to the rest of the team in near real time.

The app provides three different ways to send data out.

eChook Private Live Data

This is our own in house system available at data.echook.uk. Each car has a login, only people with that login can see your data. This is a free service provided by eChook to anyone using the app - it can also be used with custom hardware so long as it sends the correct data to the app (See Bluetooth Communication section).

dweet.io

This is a free, publicly available service for sending data over the internet, but there is no privacy, anyone with your ID code (or 'Thing Name') can see your data. This does allow some nice features such as FreeBoard or Node Red Integration.

Custom URL

You can enter a URL, username and password into the app and it will send data to your server in the format of:

https://username:[e-mail]/../{Stringified JSON}

Data available in telemetry:

Data	Identifier	Unit	Comment
Total Voltage	Vt	Volts	Combined voltage of both batteries - ~24V expected
Lower Battery Voltage	V1	Volts	Upper battery voltage can be calculated on freeboard by Vt-V1
Current	A	Amps
Motor RPM	RPM	RPM
Vehicle Speed	Spd	Meters per second	Multiply by 2.23694 for MPH
Throttle	Thrtl	Percent
Temperature 1	Tmp1	°C
Temperature 2	Tmp2	°C
Amp Hours Used	AH	Amp hours
Lap Number	Lap	-	Current Lap number as counted by the app.
Gear	Gear	-	Current gear as calculated by app
Brake Applied	Brk	-	100 if brake is applied, 0 if not.
Longitude	Lon	Degrees	GPS Longitude. (Not available through dweet.io)
Latitude	Lat	Degrees	GPS Latitude. (Not available through dweet.io)