2 layers10 × 12.3 mm
2 layers82 × 72.2 mm
HT 485
lucafaccin/HT_485Modbus RTU H/T Sensor
- Size
- 82 × 72.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 117
- Nets
- 88
- Pads
- 353
- Tracks, vias
- 696, 238
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 7 Jul 2022
- Updated
- 4 Oct 2024
Overview
HT 485 is an open-source printed circuit board by lucafaccin, from the lucafaccin/HT_485 repository on GitHub. It is a 2-layer board of 82 × 72.2 mm with 117 parts on 88 nets, routed with 696 tracks and 238 vias.
It is built around the MAX485ED, ESP32-S3-WROOM-1U-N16R8 and TL082, with the L7805, BAR43SFILM and SI2302CDS among its other parts. Its parts include 47 resistors, 22 capacitors, 16 diodes, 10 transistors and 8 ICs. It belongs with the ESP32 boards of this library.
Main components
10
MAX485ED
SOP-8-40℃~+85℃ 1 1 1mA 32 4.75V~5.25V 5Mbps Half-Duplex Transceiver ±8kV SOP-8 RS-485 / RS-422 ICs ROHSHTCRS-485 / RS-422 ICs
ESP32-S3-WROOM-1U-N16R8
SMD,19.2x18mm-103.5dBm -40℃~+65℃ 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA Bluetooth5.0 ESP32-S3R8 UART、SDIO、SPI、I2C、GPIO、PWM、ADC、I2S、JTAG、USB SMD,19.2x18mm WiFi Modules ROHSEspressif SystemsWiFi ModulesTL082
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 13V/us 2 2.5nA 36V 3MHz 3mV 85dB Short-Circuit Protection SOP-8 FET Input Amplifiers ROHSGcoreOperational Amplifier
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BAR43SFILM
SOT-23-3L1 Pair Series Connection 100mA 1V@100mA 30V 500nA@30V 750mA SOT-23-3L Schottky Diodes ROHSSTMicroelectronicsSchottky Diodes
SI2302CDS
SOT-231 N-channel 2.9A 20V 3.5nC@10V,4.5V 550mW 75mΩ@2.5V 850mV N-Channel SOT-23 MOSFETs ROHSVishay IntertechnologyMOSFETs
1N4148WS
SOD-3231.25V@150mA 100V 150mA 1uA@75V 200mW 2A 4ns Independent SOD-323 Switching Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Switching DiodesBC817
SOT-231 NPN 100nA 150MHz 300mW 40 45V 500mA 5V 700mV NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)BAV99
SOT-231 Pair Series Connection 1.25V@150mA 100V 215mA 250mW 4A 4ns 500nA@80V SOT-23 Switching Diodes ROHSNexperiaSwitching Diodes
VS-30BQ060HM3/9AT
DO-214AB(SMC)-55℃~+150℃ 1 Independent 1.2kA 3A 500uA@60V 60V 760mV@6A DO-214AB(SMC) Schottky Diodes ROHSVishay IntertechnologySchottky Diodes
Parts
117| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 4K7 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R32, R33, R34, R35, R36, R37, R41, R42, R43, R44, R45, R46 |
| 11 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R5, R7, R8, R11, R14, R19, R24, R26, R27, R30 |
| 9 | 100nF | Capacitor_SMD:C_0805_2012Metric | C4, C8, C11, C12, C13, C14, C20, C24, C25 |
| 8 | 10R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6, R16, R21, R23, R31, R38, R39, R40 |
| 6 | BAR43SFILM | Package_TO_SOT_SMD:SOT-23 | D2, D10, D11, D12, D13, D14 |
| 6 | Si2302CDS | Package_TO_SOT_SMD:SOT-23 | Q5, Q6, Q7, Q8, Q9, Q10 |
| 5 | 1N4148WS | Diode_SMD:D_SOD-323 | D4, D5, D6, D7, D8 |
| 4 | 10K 1% | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R13, R15, R18, R25 |
| 4 | BC817 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4 |
| 3 | 0R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R20, R28, R29 |
| 2 | 100uF/25V | Capacitor_SMD:CP_Elec_6.3x7.7 | C18, C19 |
| 2 | 10uF / 25V | Capacitor_SMD:C_0805_2012Metric | C6, C7 |
| 2 | 120R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R22, R47 |
| 2 | 1K 1% | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R3 |
| 2 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C22, C23 |
| 2 | 485_1 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal | J1, J2 |
| 2 | MAX485 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U8, U9 |
| 2 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2 |
| 1 | 1000uF/25V | Capacitor_SMD:CP_Elec_10x10.5 | C15 |
| 1 | 100R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10 |
| 1 | 100uF/75V | Capacitor_SMD:CP_Elec_8x10.5 | C5 |
| 1 | 10K 1% 20g -3296Y-1-103LF | Potentiometer_THT:Potentiometer_Bourns_3296Y_Vertical | RV1 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C9 |
| 1 | 1K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9 |
| 1 | 1nF | Capacitor_SMD:C_0805_2012Metric | C16 |
| 1 | 1nF/25V | Capacitor_SMD:C_0805_2012Metric | C10 |
| 1 | 1uF / 25V | Capacitor_SMD:C_0805_2012Metric | C21 |
| 1 | 1uF/16V | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 3.9V / 1W | Diode_SMD:D_SOD-128 | D16 |
| 1 | 33K 1% | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R17 |
| 1 | 485_PWR_1 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | SW1 |
| 1 | 485_PWR_2 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | SW2 |
| 1 | 560R 1% | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12 |
| 1 | 5K6 1% | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | BAV99 | Package_TO_SOT_SMD:SOT-23 | D9 |
| 1 | ESP32-S3-WROOM-1U-N16R8 | Espressif:ESP32-S3-WROOM-1 | U4 |
| 1 | H/T Sensor | Connector_JST:JST_PH_S6B-PH-SM4-TB_1x06-1MP_P2.00mm_Horizontal | J4 |
| 1 | L7805 | Package_TO_SOT_SMD:TO-252-3_TabPin2 | U1 |
| 1 | LD1086DT33TR | Package_TO_SOT_SMD:TO-252-3_TabPin2 | U3 |
| 1 | LM2576S-12/NOPB | Package_TO_SOT_SMD:TO-263-5_TabPin3 | U5 |
| 1 | MSS1210-104KED -100uH | HT485:MSS1210-104KED | L1 |
| 1 | PRG | Connector_PinSocket_2.54mm:PinSocket_2x03_P2.54mm_Vertical | J5 |
| 1 | PT1000 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-2-3.5-H_1x02_P3.50mm_Horizontal | J3 |
| 1 | PWR | TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal | J6 |
| 1 | PWR | LED_SMD:LED_0805_2012Metric | D3 |
| 1 | T | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | T. | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP3 |
| 1 | TL082 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U2 |
| 1 | TL431DBZ | Package_TO_SOT_SMD:SOT-23 | U7 |
| 1 | VS-30BQ060HM3/9AT | Diode_SMD:D_SMB-SMC_Universal_Handsoldering | D1 |
| 1 | VSSAF522-M3/H | Diode_SMD:D_SMA-SMB_Universal_Handsoldering | D15 |
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Questions
How big is the HT 485 PCB?
It measures 82 × 72.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HT 485 use?
117 parts, built around the MAX485ED, ESP32-S3-WROOM-1U-N16R8, TL082 and L7805. 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 HT 485 KiCad files?
From the lucafaccin/HT_485 repository on GitHub, at the commit this page was made from: the board is HT_485.kicad_pcb and its schematic HT485_DS/HT485_DS.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the HT 485 design in my own project?
Its repository states no licence, so its author keeps all rights: ask lucafaccin before reusing the design.