70MHz-Soil-Sensor
About the 70MHz-Soil-Sensor PCB
70MHz-Soil-Sensor is an open source PCB design by jhns-de, published on GitHub. It is a 4-layer board measuring 49 × 80 mm, with 114 components from 52 distinct parts.
Other key parts include the BL652-SA-01-T/R, ADS1115IDGSR, MCP9808_MSOP, ADA4857-1YRZ-R7 and AD8691AKSZ-REEL7. By type, the board carries 46 capacitors, 28 resistors, 15 ICs, 9 connectors, 7 diodes and 5 inductors.
It belongs with the sensors and test & measurement designs in this gallery.
From the project
Soil moisture and electrical conductivity (EC) sensor based on 70 MHz impedance measurement, developed as part of my master’s thesis.
Soil moisture and electrical conductivity (EC) sensor based on 70 MHz impedance measurement, initially developed as part of my master's thesis.
At 70 MHz, the ionic charge transport in soil is much slower than the dipole rotation of water molecules. This frequency therefore allows a clearer separation between the conductive and dielectric components of the soil response, improving the accuracy of both EC and volumetric water content (VWC) estimation.
Main components on the 70MHz-Soil-Sensor
70MHz-Soil-Sensor bill of materials (BOM)
114 components, 52 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | BL652-SA-01-T/R BL652 | Laird_BL652 | U102 |
| 1 | ADS1115IDGSR ADS1115IDGS | TSSOP-10_3x3mm_P0.5mm | U103 |
| 1 | MCP9808_MSOP | MSOP-8_3x3mm_P0.65mm | U104 |
| 3 | ADA4857-1YRZ-R7 ADA4857-1 | SOIC-8_3.9x4.9mm_P1.27mm | U201, U401, U402 |
| 1 | AD8691AKSZ-REEL7 AD8691 | SOT-353_SC-70-5 | U202 |
| 2 | TLV3603DCKR TLV3603 | SOT-363_SC-70-6 | U301, U304 |
| 2 | SN74LXC1T14DCKR SN74LXC1T14 | SOT-353_SC-70-5 | U302, U305 |
| 1 | SN74AUC1G86DCKR 74AUC1G86 | SOT-353_SC-70-5 | U303 |
| 1 | MCP1711T-33I/OT | SOT-23-5 | U501 |
| 1 | ADP7142ARDZ-1.8 | SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U502 |
| 1 | ADP7142ARDZ-3.3 | SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U503 |
| 1 | BFS20,215 | SOT-23-3 | Q201 |
| 1 | 7M-27.000MEEQ-T | Crystal_SMD_TXC_7M-4Pin_3.2x2.5mm | Y201 |
| 1 | SI5351A-B-GTR Si5351A-B-GT | MSOP-10_3x3mm_P0.5mm | Y202 |
| 1 | PH1-03-UA 1wire | PinHeader_1x03_P2.54mm_Vertical | J101 |
| 1 | PH1-05-UA Debug | PinHeader_1x05_P2.54mm_Vertical | J102 |
| 2 | PH1-04-UA I2C | PinHeader_1x04_P2.54mm_Vertical | J103, J107 |
| 3 | 829-22-001-20-001101 | 8292200120001101 | J104, J105, J106 |
| 1 | PH1-02-UA power | PinHeader_1x02_P2.54mm_Vertical | J501 |
| 1 | USB4125-GF-A-0190 USB_C_Receptacle_PowerOnly_6P | USB_C_Receptacle_GCT_USB4125-xx-x-0190_6P_TopMnt_Horizontal | J502 |
Show 32 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PTS647SN50SMTR2 LFS Reset | SW_SPST_PTS647_Sx50 | SW101 |
| 3 | APHD1608LCGCK LED | LED_0603_1608Metric | D101, D102, D501 |
| 2 | SMS7621-079LF | SODFL1608X70N | D401, D402 |
| 2 | 8231706A | D_0402_1005Metric | D502, D503 |
| 1 | BLM15PX471SN1D 470R | L_0402_1005Metric | FB501 |
| 2 | MLJ1005HXGR16JTD0B 160n | L_0402_1005Metric | L201, L203 |
| 1 | MLJ1005WR18JT000 180n | L_0402_1005Metric | L202 |
| 1 | MLH2012F22NKT000 22n | L_0805_2012Metric_Pad1.05x1.20mm_HandSolder | L501 |
| 19 | GRM155R61E104KA87D 100n | C_0402_1005Metric | C101, C102, C103, C201, C202, C211, C212, C301 +11 |
| 2 | GRM1555C1H100JA01D 10p | C_0402_1005Metric | C203, C209 |
| 2 | GRT1555C1H560JA02J 56p | C_0402_1005Metric | C204, C210 |
| 2 | GRT1555C1H910FA02D 91p | C_0402_1005Metric | C205, C206 |
| 2 | GRM155R61E105MA12D 1u | C_0402_1005Metric | C207, C208 |
| 5 | GRM1555C1H101GA01D 100p | C_0402_1005Metric | C309, C310, C312, C403, C404 |
| 4 | GRM155R61H105KE05J 1u | C_0402_1005Metric | C501, C502, C503, C504 |
| 2 | C3216X5R1E476M160AC 47u | C_1206_3216Metric | C505, C508 |
| 2 | GRM155R6YA225KE11J 2u2 | C_0402_1005Metric | C506, C509 |
| 2 | GCM1555C1H102GA16J 1n | C_0402_1005Metric | C507, C510 |
| 1 | GRM155R61E225KE11D 2u2 | C_0402_1005Metric | C511 |
| 1 | GRM1555CYA103GE01D 10n | C_0402_1005Metric | C512 |
| 2 | GRM31CR61C476ME44K 47u | C_1206_3216Metric | C514, C515 |
| 3 | MCS04020C4701FE000 4k7 | R_0402_1005Metric | R101, R105, R106 |
| 3 | ERA-2AEB103X 10k | R_0402_1005Metric | R102, R301, R303 |
| 1 | ERA-6AEB222V 2k2 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R103 |
| 1 | ERA-6AEB102V 1k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R104 |
| 10 | MCS04020C1001FE000 1k | R_0402_1005Metric | R107, R108, R201, R204, R206, R208, R209, R211 +2 |
| 3 | TNPW040250R0DEED 50R | R_0402_1005Metric | R202, R203, R205 |
| 1 | RR0510P-104-D 100k | R_0402_1005Metric | R207 |
| 1 | MCS0402MC1008FE000 1R | R_0402_1005Metric | R210 |
| 1 | ERA-2AEB163X 16k | R_0402_1005Metric | R302 |
| 2 | RNCP1206FTD10R0 10R | R_1206_3216Metric | R502, R505 |
| 2 | RT0402FRE075K1L 5k1 | R_0402_1005Metric | R503, R504 |
70MHz-Soil-Sensor design files
The KiCad project lives in the jhns-de/70MHz-Soil-Sensor repository on GitHub; these links point at the commit this page was built from.
70MHz-Soil-Sensor: common questions
How big is the 70MHz-Soil-Sensor PCB?
The 70MHz-Soil-Sensor measures 49 × 80 mm, has 4 copper layers and is 1.579 mm thick.
How many components are on the 70MHz-Soil-Sensor?
114 components, from 52 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 70MHz-Soil-Sensor design files?
From the jhns-de/70MHz-Soil-Sensor 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 70MHz-Soil-Sensor design in my own project?
The repository has no license, so all rights stay with jhns-de. Use it as a reference, and ask the author before reusing the design.
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