Ithowifi
About the Ithowifi PCB
Ithowifi is an open source ESP32 PCB design by arjenhiemstra, published on GitHub. It is a 2-layer board measuring 42.3 × 45.1 mm, with 29 components from 22 distinct parts.
Its main chip is the C82899, from the ESP32 family. Other key parts include the CC1101-868MHz-Module and C2692194. By type, the board carries 11 resistors, 5 capacitors, 4 connectors, 3 ICs, 2 transistors and 2 LEDs.
It belongs with the rf & radio designs in this gallery.
Main components on the Ithowifi
Ithowifi bill of materials (BOM)
29 components, 22 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | C82899 ESP32-WROOM | ESP32-WROOM-32 | U1 |
| 1 | CC1101-868MHz-Module | CC1101-868MHz-Module | U2 |
| 1 | C2692194 AMS1117-3.3 | SOT-223-3_TabPin2 | U3 |
| 2 | C78284 BSS138 | SOT-23 | Q1, Q2 |
| 1 | C3294460 CONN_01X07 | PinHeader_1x07_P2.54mm_Vertical | J1 |
| 1 | C3975149 conn | PinSocket_2x04_P2.54mm_Vertical | J2 |
| 1 | Conn_Coaxial | SMA_Amphenol_132289_EdgeMount | J3 |
| 1 | TC2030-MCP-NL | TC2020-MCP-NL | J4 |
| 1 | ATtiny1614-SS | SOIC-14_3.9x8.7mm_P1.27mm | ATtiny1614 |
| 1 | C84256 WIFI status | LED_0805_2012Metric | LED1 |
| 1 | C84256 itho status | LED_0805_2012Metric | LED2 |
| 1 | D_Zener | D_SOD-123 | D1 |
| 1 | 0,1uF | L_0805_2012Metric | C1 |
| 1 | C28323 1uF | C_0805_2012Metric | C2 |
| 1 | C7229 10uF | CP_EIA-3216-12_Kemet-S | C4 |
| 1 | C49678 0.1uF | C_0805_2012Metric | C5 |
| 1 | C15850 10uF | CP_EIA-3216-12_Kemet-S | C6 |
| 4 | C17414 R10K | R_0805_2012Metric | R1, R2, R3, R4 |
| 2 | C17408 R100 | R_0805_2012Metric | R5, R9 |
| 1 | R10K | R_0805_2012Metric | R6 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | C17414 10K | R_0805_2012Metric | R7, R8, R10 |
| 1 | U2 | Converter_DCDC_RECOM_R-78E-0.5_THT | R-78E5.0 |
Ithowifi design files
The KiCad project lives in the arjenhiemstra/ithowifi_hardware repository on GitHub; these links point at the commit this page was built from.
Ithowifi: common questions
What microcontroller does the Ithowifi use?
The Ithowifi is built around the C82899, from the ESP32 family.
How big is the Ithowifi PCB?
The Ithowifi measures 42.3 × 45.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Ithowifi?
29 components, from 22 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 Ithowifi design files?
From the arjenhiemstra/ithowifi_hardware repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Ithowifi design in my own project?
The repository has no license, so all rights stay with arjenhiemstra. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Ithowifi without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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