This is the mechatronics bench you already know: the same fixed inventory, the same terminals, the same leads. Run a lead from the supply, through a button, to a lamp. Close the breaker and find out whether you wired it right.
Built for the engineering students of the National College of Science and Technology. Nothing to install to try it, and no account until you want to save a circuit.
The panel here is the one in the engineering laboratory, part for part, so the wiring you practice at home is the wiring you are marked on in the lab. It follows the course for all four programs.
The inventory is fixed, like the real trainer. Parts wait in the bin and go back to their own slot on the panel — nothing is ever conjured up beyond this list.
Every lead end carries a female and a male. The female drops onto a terminal post or onto another lead, and one male holds exactly one female — so a busy terminal grows a tower, exactly like the bench. Female onto female is refused, and so is a chain that loops back on itself.
Connected terminals merge into nets, power floods out from the supply once the breaker is closed, then every coil and lamp is evaluated and the contacts that moved send it round again. That last part is what makes a self-holding latch hold.
Short a net across supply and ground with no load between them and the breaker trips, leaving the board dead until you reset it. Put a device the wrong way round and it reads as reversed polarity rather than quietly working.
Save the board as a file and it carries the whole thing: every part, every lead, every length of tubing. Send it over chat, open it on another device, or keep it yourself. Nobody needs an account at either end, which is what makes it the honest way to share work with a classmate.
The session alarm sits in the toolbar, not on the board, because nothing you wire depends on a clock. Set five minutes or sixty, or leave it off and practice untimed.
Latest build 1.45 · released 22 September 2026
The Android build carries the whole trainer inside the app, so it works with the data off. Circuits are kept on the phone until you sign in; after that they go to your account, and any device you sign in on opens them. Either way a circuit can be sent as a file, which is how you hand one to a classmate who has no account.
Android asks before installing anything that did not come from the Play Store, which is why it warns you. Once installed, the app checks this page on startup and offers you the newer build when there is one. Coming from a build older than 1.44 means uninstalling that one first — it was signed with a temporary key, and Android will not update across a change of key. To build your own instead, the source is on GitHub and npm run apk makes this same file.
Mechatronic
Offline Android app
Download the APK