Top edge — all connectors (cables exit upward; pedalboard-friendly)
Trig In
Inst In
Out TRS
9V DC
USB-C
↕≈ 1.8 in
(45 mm)
(45 mm)
PM‑1 Polymeter PlayerPWR
2.0″ 320×240 IPS TFT (ST7789) — beat & subdivisions on‑screen
Play / Stop
Prev
TEMPO
Tap
Next
Load a configuration onto the device
Same firmware as the idealized unit — only the panel hardware differs. Paste a patch
(e.g. v1;t120;kick:4;snare:4=.X.X;hatClosed:4/2), a set‑list code, or a
#p=…/#sl=… link.
or pick a built-in or saved set list:
Back view — PCB & components (mounting holes at the corners)
↕ 5.5 in (140 mm)
Trig · Inst · Out TRS · 9V DC · USB-C — top-edge jacks
ST7789 2.0″ 320×240 TFT
9 V→5 V buck
RP2040
PLAY
PREV
ENC
TAP
NEXT
Analog audio — PCM5102 · NE5532 · DRV134 · PAM8302
SPKR
↔ 4.7 in (120 mm)
Bill of materials
Rough parts list for the device above — a pedalboard‑friendly RP2040 build (9 V DC or USB‑C) with analog click injection. Ballpark one-off prices (USD); cheaper at volume.
| Part | Qty | ~$ |
|---|---|---|
| Brain & display | ||
| RP2040 board, USB‑C — e.g. Waveshare RP2040‑Zero / Pico‑clone | 1 | 4 |
| 2.0″ 320×240 IPS TFT, ST7789 — SPI | 1 | 8 |
| Controls | ||
| Arcade pushbutton, 24 mm — Prev · Next · Tap | 3 | 4 |
| Arcade pushbutton, 30 mm — Play | 1 | 2 |
| Detented encoder (EC11 / PEC12) + side‑mount thumb‑roller — recessed; nothing to snap off | 1 | 2 |
| Audio — analog click injection | ||
| PCM5102A I²S DAC — line‑level click | 1 | 3 |
| Dual op‑amp, NE5532 / OPA2134 — hi‑Z instrument buffer + summing mixer | 1 | 1 |
| Balanced line driver, DRV134 — (or cross‑coupled op‑amp) → 1/4″ TRS out | 1 | 4 |
| PAM8302A mono Class‑D + 8 Ω 2 W speaker — monitor | 1 | 4 |
| Connectors & power | ||
| 1/4″ jack — Inst In (TS) · Out (TRS) · Trig In (TS) | 3 | 3 |
| USB‑C bus power (5 V) + PWR LED — same port carries config; no battery | 1 | 1 |
| 9 V DC pedal jack (2.1 mm centre‑neg) + 9 V→5 V buck + reverse‑polarity protect — pedalboard power | 1 | 3 |
| Build | ||
| Custom PCB (or perfboard) | 1 | 5 |
| Passives, headers, wire — R/C for the analog stage + decoupling | — | 3 |
| Die‑cast aluminium enclosure (Hammond 1590‑style) — or folded stainless — pedal‑grade | 1 | 12 |
| Total (one‑off) | ≈ $59 | |
Audio is summed in the analog domain: the DAC's click is mixed with a high‑impedance buffer of the 1/4″ instrument input, then fed to the balanced line driver (1/4″ TRS out) and the monitor amp — so your instrument is never re‑digitised (no added latency).