2 layers86 × 66.1 mm
Mayfly adapter v1p1 revC
millerlp/Mayfly_adapter
Circuit board for interfacing 8 analog sensors with EnviroDIY Mayfly v1.1
24 partsGPL-3.0
2 layers86 × 66.1 mm
Mayfly adapter v1p1 revB
millerlp/Mayfly_adapterCircuit board for interfacing 8 analog sensors with EnviroDIY Mayfly v1.1
- Size
- 86 × 66.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 47
- Nets
- 92
- Pads
- 278
- Tracks, vias
- 860, 111
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 29 May 2025
- Updated
- 29 May 2025
Overview
Mayfly adapter v1p1 revB is an open-source printed circuit board by millerlp, from the millerlp/Mayfly_adapter repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 86 × 66.1 mm with 47 parts on 92 nets, routed with 860 tracks and 111 vias.
It is built around the PCA9557PW. Its parts include 6 capacitors, 6 resistors and 4 ICs. It belongs with the interfaces and adapters boards of this library.
Main components
1README
README.mdMayfly_adapter
A circuit board for interfacing 8 analog sensors with an EnviroDIY Mayfly v1.1 data logger. This can be used to monitor multiple simple analog voltage inputs. Using the software library linked below, the user can cycle through 8 inputs of an analog multiplexer (TMUX1208PWR, Texas Instruments) and send the chosen voltage signal to the analog-to-digital convertor of the Mayfly data logger. The board also has an 8-channel port expander (PCA9557PWR) that can be used to toggle the SLEEP pin of an attached analog sensor like the Allegro A1395 Hall effect sensor that this board is designed for.
As of 2025, the RevB hardware files are functional and in use. These can be used to produce a printed circuit board that can be populated with the parts listed in the file Mayfly_adapter_v1p1_revB_parts.xlsx.
While the circuit board contains circuits for reading 8 multiplexed analog inputs and 8 multiplexed I2C lines, only the analog input lines are implemented in the associated library found at https://github.com/millerlp/Allegro_A139x_8channel_mux.
Note that this 8-Channel library also relies on a modified library for the PCA9557 library found here: https://github.com/millerlp/pca9557
On the bottom of the Mayfly data logger board, some of the solder jumpers should be modified:
On solder jumper 19 (SJ19), move the solder blob from 12 to 13. On solder jumper 16 (SJ16), place a blob of solder (activates modem power LED - white) On solder jumper 17 (SJ17), place a blob of solder (activates modem network indicator LED - blue)
Developed by Luke Miller
Parts
47| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | Jumper_3_Bridged12 | Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm | JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8, JP9, JP10, JP11 |
| 8 | 1x4-2.0MM | Connectors_JST:JST_PH_B4B-PH-K_04x2.00mm_Straight | HALL0, HALL1, HALL2, HALL3, HALL4, HALL5, HALL6, HALL7 |
| 8 | 1x4_MOLEX_KK | MOLEX_KK_22-11-2042:MOLEX_22-11-2042 | HEART0, HEART1, HEART2, HEART3, HEART4, HEART5, HEART6, HEART7 |
| 4 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C4, C5 |
| 4 | 10k ohm | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4 |
| 4 | 2X10P-2.54 | Mayfly_v1p0_revA3_public:H2X10-2.54 | H1, H2, H3, H4 |
| 2 | 100k ohm | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | 1uF | Capacitor_SMD:C_0603_1608Metric | C3, C6 |
| 2 | PCA9557PW | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U1, U3 |
| 1 | TCA9548AMRGER | Package_DFN_QFN:Texas_RGE0024C_EP2.1x2.1mm | U2 |
| 1 | TMUX1208PWR | TMUX1208PWR:SOP65P640X120-16N | U4 |
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Questions
How big is the Mayfly adapter v1p1 revB PCB?
It measures 86 × 66.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Mayfly adapter v1p1 revB use?
47 parts, built around the PCA9557PW. 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.
Where can I download the Mayfly adapter v1p1 revB KiCad files?
From the millerlp/Mayfly_adapter repository on GitHub, at the commit this page was made from: the board is Mayfly_adapter_v1p1_revB/Mayfly_adapter_v1p1_revB.kicad_pcb and its schematic Mayfly_adapter_v1p1_revA/Mayfly_adapter_v1p1_revA.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Mayfly adapter v1p1 revB design in my own project?
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).