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Introduction

This device has two uses: 

DIY accurate Battery monitor / fuel gauge / Watt meter
DIY accurate Battery monitor / fuel gauge / Watt meter

DIY accurate Battery monitor / fuel gauge / Watt meter
DIY accurate Battery monitor / fuel gauge / Watt meter

Update 19-11-2021

The Wattmeter will be available for sale maybe in 2022 it depends on the availability of the chips.

Properties

  • The measured values (Volt, Ampere, Watt, Amperehour) are sent by bluetooth to one or more meters on the handlebar.
  • The capacity is also displayed with 6 LEDs on the board.
  • The absolute maximum voltage is 50V, which corresponds to so-called 36V batteries.
  • In this application, it has nothing to do with Yamaha and it is just a universal fuel gauge / Watt meter.

Advantages

These are the advantages compared to other fuel gauge / Watt meters:

  • It measures the real capacity in Ampere x hour
    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 meters 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 meters on the handlebar. I have developed special lightweight round 40mm LED meters for this.

NOG AFMAKEN..............................................

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

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

See for the user manual here.

Dongle during development 

Yamaha PW X2 serial data
Yamaha PW X2 serial data


Pedelec forum

 

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