Diagno
A pocket-sized multi-tool test instrument — measuring, generating, and sniffing almost anything on a bench. It started as a single-probe AVR prototype and, after real testing exposed its limits, was rebuilt into the four-probe tool it is today — with a next generation already designed.
Three generations
Same idea, three very different builds. Pick a version to read the full story.
Diagno V0
The original AVR-based unit: one multiplexed test needle, a monochrome display, and a set of field-test notes that exposed exactly what needed to change.
Read the V0 story →
Diagno V1
An RP2040-based rebuild with four independent test probes, a color TFT screen, a full bus-probe mode, and a live PC companion app. Working today, across two hardware revisions.
Read the V1 story →Diagno V2
A freshly-designed next generation: RP2350, a larger display, USB-C, and a move to ready-assembled boards instead of hand-built prototypes.
See the V2 preview →Featured
Posts, write-ups, and mentions of Diagno from around the web.
Showcase projects
Three circuits built specifically to put every Diagno capability through its paces — planned builds, not started yet.
Showcase Project 1
A test circuit built to exercise Diagno's measurement side — voltage, resistance, diode, frequency, and logic probing all on one board.
Showcase Project 2
A circuit built to put Diagno's generator side to work — PWM, stepper, servo, DAC, and shift-register output driven from the same board.
Showcase Project 3
A circuit built around Diagno's communication and bus-probe features — I2C, UART, SPI, and the multi-bit bus probe, all in one demo.