Calctext mainboard
About the Calctext mainboard PCB
Calctext mainboard is an open source PCB design by tomekjersey0, published on GitHub. It is a 4-layer board measuring 65 × 97.8 mm, with 20 components from 12 distinct parts.
Other key parts include the Wio-E5-LE, TPS61299DRLR and PCAL9535APW,118. By type, the board carries 8 capacitors, 6 resistors, 3 ICs, 2 inductors and 1 connector.
It belongs with the rf & radio, iot & wireless and displays & leds designs in this gallery.
From the project
Custom embedded calculator hardware design (KiCad) with integrated LoRa communication and low-power system architecture.
CalcText is a wireless messaging device enclosed inside a scientific calculator, powered by a single AAA battery. Two units can message each other directly over LoRa, not requiring Wi-Fi, mobile data, or any kind of external infrastructure. The idea came to me from wanting to message a friend who sat far away from me in my maths class without using my phone or shouting. Despite being a little odd, the idea stuck with me.
Main components on the Calctext mainboard
Calctext mainboard bill of materials (BOM)
20 components, 12 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Wio-E5-LE Seeed Studio | Wio-E5-LE | U1 |
| 1 | TPS61299DRLR TPS61299 Texas Instruments | Texas_R-PDSO-N6_DRL-6 | U2 |
| 1 | PCAL9535APW,118 NXP Semiconductors | TSSOP-24_4.4x7.8mm_P0.65mm | U3 |
| 1 | FH34SRJ-10S-0.5SH(99) FH34SRJ-10S-0.5SH Hirose Electric | Hirose_FH34SRJ-10S-0.5SH | J1 |
| 1 | WIP252010P-1R0ML 1uH INPAQ | L_INPAQ_WIP252010 | L1 |
| 1 | RC0402JR-070RL 0R YAGEO | L_0402_1005Metric | L2 |
| 2 | CL21B106KOQNNNE 10uF Samsung Electro-Mechanics | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2 |
| 3 | C0603C104K5RACTU 100nF KEMET | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C5, C6 |
| 1 | CL10B475KQ8NNNC 4.7uF Samsung Electro-Mechanics | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4 |
| 2 | DNP | C_0402_1005Metric | C7, C8 |
| 3 | RMCF0603FT100K 100kΩ Stackpole Electronics | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R3 |
| 3 | RC0603FR-0710KL 10kΩ YAGEO | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4, R5, R6 |
Calctext mainboard design files
The KiCad project lives in the tomekjersey0/calc-text repository on GitHub; these links point at the commit this page was built from.
Calctext mainboard: common questions
How big is the Calctext mainboard PCB?
The Calctext mainboard measures 65 × 97.8 mm, has 4 copper layers and is 1.600198 mm thick.
How many components are on the Calctext mainboard?
20 components, from 12 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Calctext mainboard design files?
From the tomekjersey0/calc-text repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Calctext mainboard design in my own project?
The repository has no license, so all rights stay with tomekjersey0. Use it as a reference, and ask the author before reusing the design.
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