mlnoga/pimoco11Telescope mount and focuser control with a Raspberry Pi
Pimoco is an open-source printed circuit board by mlnoga, from the mlnoga/pimoco repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 172.2 × 82.8 mm with 22 parts on 51 nets, routed with 496 tracks and 17 vias.
It is built around the TMC5160-BOB, BMP280 and LM2576S-5.0. Its parts include 7 ICs, 7 connectors, 2 capacitors, 2 diodes and 1 inductor.
Telescope mount and focuser control with a Raspberry Pi
Why do we need a separate device to control stepper motors attached to a telescope? Often times, a Raspberry Pi 4 running Ekos/Kstars/Indi will be attached to the telescope anyway, providing plenty of compute power. Modern stepper motor controllers like the Trinamic TMC5160 have an on-board motion controller which accepts position read, set target speed and go-to commands via SPI. The Raspberry Pi has two such interfaces for a total of five devices on its GPIO port.
This is
| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | TMC5160-BOB | pimoco:TMC5160-BOB2 | U0, U1, U2, U3 |
| 1 | 100 uF | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C1 |
| 1 | 100 uH | Inductor_THT:L_Radial_D12.5mm_P7.00mm_Fastron_09HCP | L1 |
| 1 | 1000 uF | Capacitor_THT:CP_Radial_D13.0mm_P5.00mm | C2 |
| 1 | 1N5822 | Diode_THT:D_DO-201AD_P15.24mm_Horizontal | D2 |
| 1 | BMP280 | pimoco:BMP280-Breakout | U4 |
| 1 | CXO_DIP14_10MHz | Oscillator:Oscillator_DIP-14 | X1 |
| 1 | DS18B20 RJ45 | pimoco:RJ45_Wuerth_7499111446_Horizontal-modified | J4 |
| 1 | D_Schottky_5A | Diode_THT:D_DO-201AD_P15.24mm_Horizontal | D1 |
| 1 | Dec/Alt | pimoco:DSUB-9_Female_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mmv2 | J1 |
| 1 | Focuser | pimoco:DSUB-9_Female_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mmv2 | J3 |
| 1 | Fuse 5A | Fuse:Fuseholder_Cylinder-5x20mm_Schurter_0031_8201_Horizontal_Open | F1 |
| 1 | GY-GPS6MV2 | pimoco:GY-GPS6MV2 | U5 |
| 1 | Heatsink | pimoco:Heatsink_TO-220_vertical | HS1 |
| 1 | LM2576S-5 | Package_TO_SOT_THT:TO-220-5_Vertical | U6 |
| 1 | Power | Connector_BarrelJack:BarrelJack_Horizontal | J5 |
| 1 | RA/Az | pimoco:DSUB-9_Female_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mmv2 | J0 |
| 1 | RasPi_Header | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | J6 |
| 1 | Rotator | pimoco:DSUB-9_Female_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mmv2 | J2 |
It measures 172.2 × 82.8 mm and has 2 copper layers, 1.6 mm thick.
22 parts, built around the TMC5160-BOB, BMP280 and LM2576S-5.0. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the mlnoga/pimoco repository on GitHub, at the commit this page was made from: the board is hardware/pimoco.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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