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Introduction

This device has also another use: Yamaha battery hack for using 3rd party batteries. The sales information is also on that page.

Yamaha battery hack / Wireless battery Fuel Gauge / Watt meter
Yamaha battery hack / Wireless battery Fuel Gauge / Watt meter

Bluetooth battery Fuel Gauge / Watt meter
Bluetooth battery Fuel Gauge / Watt meter

Universal wireless battery fuel gauge / Watt meter

In this application, it has nothing to do with Yamaha and it is just a universal fuel gauge / Watt meter. It has advantages over other meters:

  • Measures the real capacity
    Other fuel gauges often calculate the capacity based on the battery voltage, which is very inaccurate.
  • The capacity is stored in a non-volatile memory.
    Normally, a fuel gauge should never be disconnected from the battery, otherwise the capacity value will be lost. Therefore a fuel gauge is always built inside the battery case. But an externally connected fuel gauge, like this one, will be disconnected from a battery often since a battery can have a power on/off switch. So we store the battery capacity in an EEPROM.
  • Bluetooth connection to a round LED meter on the handlebar
    The big advantage is that the system is split in two, no thick power cables are needed to the meters on the handlebar as with other gauges. The meter board can be connected directly and nearby to the output of the battery. The measured values (Volt, Ampere, Watt, Amperehour) are sent by bluetooth to one or more LED meters on the handlebar. The LED meters are 40mm in diameter and very lightweight:

Watt meter 40mm on the handlebarWatt meter 40mm on the handlebarWatt meter 40mm on the handlebarWatt meter 40mm on the handlebar

The fuel gauge is also displayed with 6 LEDs on the board. If the battery is switched off or disconnected, the capacity-value must be restored when it is switched on again. The battery capacity is therefore stored in EEPROM.

Connections

The connections differs according to the type of battery:

Wattmeter connections to battery with common port
Wattmeter connections to battery with common port

Wattmeter connections for dual port battery
Wattmeter connections for dual port battery

User manual

  • AFMAKEN..............................................................................................

Dongle during development 

Yamaha PW X2 serial data
Yamaha PW X2 serial data


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