The Activity Meter is pedometer that is to be used with Walk with me!, calculating one’s personal life rythm.
The Pokéwalker is an advanced pedometer device bundled with Pokémon HeartGold & SoulSilver that enhances the gameplay in certain ways.
Both feature an infrared receiver/transmitter that allows them to connect to create a connection between an infrared enabled DS cartridge, and both use an accelerometer instead of a pendulum mechanism.
The disassembly of both devices was actually straightforward (tri-wing screwdriver required) though Pokéwalker’s LCD screen was apparently soldered and I didn’t risk putting more strain on its connectors. Here they lie side by side, opened up, with their circuits exposed.<
