A tiny Bluetooth module that reads every ignition edge straight off the coil and streams it to the Microdyno app. The app derives true, instantaneous RPM — no microphone, no audio tuning, no guesswork.
The sensor taps the ignition pickup, cleans every pulse with an opto-isolated front-end, and streams the raw edge timing over Bluetooth. All the maths happens in the app.
Connect the input to the ignition/AC pickup. A PC817 opto front-end with TVS protection turns each spark into one clean digital edge.
The ESP32-C3 timestamps each edge to the microsecond and pushes the raw stream over BLE — no averaging, no information lost.
The Microdyno app turns the edges into instantaneous RPM and a full power curve — pick your pulses-per-rev and go.
Connect after the voltage regulator. Tap the regulated 12 V AC output only — never a raw, unregulated winding, whose voltage can climb past the input's safe range at high RPM.
Reads the ignition directly, so RPM is exact even at idle or 15,000 rpm — no microphone tuning, no harmonic hunting.
Pairs with the app over Bluetooth 5.0 — no cables, no setup screens. Open the app, it connects, live RPM appears.
New firmware installs straight from the app over Bluetooth — self-healing, checksum-verified, never a cable needed.
Runs off a small LiPo, sleeps between sessions and wakes itself on the first engine pulse — or a tap of the button.
Set 1–24 pulses per rev in the app for VAPE, CDI, points or AC pickups. Single, twin, multi — it just works.
~12 g with an opto-isolated, TVS-protected input that shrugs off ignition noise and keeps the sensor safe.
In production now — reserve yours with a pre-order and it ships as soon as your batch is built.