OBeMS
About the OBeMS PCB
OBeMS is an open source PCB design by johnbeardmore, published on GitHub under the LGPL-3.0 license. It is a 2-layer board measuring 180 × 120 mm, with 123 components from 57 distinct parts.
Other key parts include the LM2575, DS18B20, TLC555, 4017 and MCP3008. By type, the board carries 57 resistors, 33 connectors, 11 capacitors, 8 ICs, 4 diodes and 2 transistors.
From the project
Open source environmental monitoring, automatic meter reading and building management system.
Open source environmental monitoring, automatic meter reading and building management system.
Note that the items in [square brackets] below are planned, but not yet implemented.
Open Source GPL2 system for energy and environmental measurement, automatic meter reading (AMR), [building energy management (BEMS), and building management (BMS)].
The system consists of server processes which provide access to sensors and actuators via IP address and port number. Server processes are used which provide user interfaces, [make BMS and BEMS decisions], and relay information to archival stores.
Main components on the OBeMS
OBeMS bill of materials (BOM)
123 components, 57 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LM2575 | TO220_5PIN | U1 |
| 1 | DS18B20 | TO92_DS18B20 | U2 |
| 1 | TLC555 | DIP-8__300_ELL | U3 |
| 1 | 4017 | DIP-16__300_ELL_lg_pad | U4 |
| 2 | MCP3008 | DIP-16__300_ELL_lg_pad | U5, U6 |
| 1 | MCP4812 | DIP-8_300_ELL | U7 |
| 1 | LM2576 | TO220_5PIN | U8 |
| 1 | BC546 | TO92-PNP_large_pad | Q1 |
| 1 | BC556 | TO92-PNP_large_pad | Q2 |
| 1 | 1WIRE | Pin_Header_Straight_1x04 | P1 |
| 1 | EXT_CAP | SIL-2_LG_PAD | P2 |
| 1 | HARD_WDT | TH_4x1_CONN | P3 |
| 1 | LED 5-8 | Pin_Header_Straight_1x04 | P4 |
| 1 | AC_INPUT | TH_3W_CamdenBoss | P6 |
| 1 | LED 1-4 | Pin_Header_Straight_1x04 | P7 |
| 1 | LT_PWR | TH_CONN_2W_LGPAD | P8 |
| 1 | V1? | SIL-3_solder_connect | P9 |
| 1 | 5V | Pin_Header_Straight_2x08 | P10 |
| 1 | 3V3 | Pin_Header_Straight_2x08 | P11 |
| 1 | GND | Pin_Header_Straight_2x08 | P12 |
Show 37 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ADC_0-7 | Pin_Header_Straight_2x08 | P13 |
| 1 | ADC_8-15 | Pin_Header_Straight_2x08 | P14 |
| 1 | ADC_VREF_2 | Pin_Header_Straight_1x02 | P15 |
| 1 | ADC_VREF_1 | Pin_Header_Straight_1x02 | P16 |
| 1 | SPI_ADC_DAC | Pin_Header_Straight_1x08 | P17 |
| 3 | DIO_OUTPUT | Pin_Header_Straight_2x12 | P18, P22, P26 |
| 3 | PULL_UP | Pin_Header_Straight_2x12_SM_Connect | P19, P23, P27 |
| 3 | GROUND | Pin_Header_Straight_2x12_SM_Connect | P20, P24, P28 |
| 3 | DIO_INPUT | HEADER_12Way_Wiedermuller_SX | P21, P25, P29 |
| 1 | UNREG_DC | Pin_Header_Straight_2x03 | P30 |
| 1 | V2? | SIL-3_solder_connect | P31 |
| 1 | V_PWR | SM_3pad_SOLDER_named | P32 |
| 1 | DAC | Pin_Header_Straight_2x04 | P34 |
| 1 | PROTOTYPING_AREA | PROTO_AREA_16x14 | P36 |
| 1 | RPi_B | RPi_B_B+_MOUNTING | CPU1 |
| 1 | 500mA | TH_Fuse_Holder_5-20_CPC | F1 |
| 1 | 1A/2A | TH_Fuse_Holder_5-20_CPC | F2 |
| 1 | PCB | PCB_120x150_WISKA | PCB1 |
| 1 | PSU_10W_5V | TH_DCDC_PowerPac_5W_10W | PSU1 |
| 1 | 500k | RV_various_lg_pad | RV1 |
| 2 | 1N5822 | TH_Diode_DO-201AD | D1, D15 |
| 1 | 1N4001 | TH_Diode_1 | D2 |
| 1 | BRIDGE | TH_BridgeRect_8A | D16 |
| 1 | 330uH | TH_Inductor | L1 |
| 1 | 100uH | TH_Inductor_ELC18B101L | L2 |
| 2 | 100u | C2V8_V | C1, C10 |
| 2 | 1000u | C2V8_V | C2, C11 |
| 6 | 1u | C1_wide_lg_pad_2 | C3, C4, C5, C7, C8, C9 |
| 1 | 47u | C2V8_VandA | C6 |
| 1 | 4k7 | TH_Resistor_1 | R1 |
| 3 | 10k | TH_Resistor_1 | R2, R8, R9 |
| 2 | 1M | TH_Resistor_1 | R3, R10 |
| 2 | 1k | TH_Resistor_1 | R4, R7 |
| 1 | 39k | TH_Resistor_1 | R5 |
| 1 | 100 | TH_Resistor_1 | R6 |
| 44 | 120 | TH_Resistor_1 | R11, R12, R13, R14, R15, R16, R17, R18 +36 |
| 3 | 100k | TH_Resistor_1 | R55, R56, R57 |
OBeMS design files
The KiCad project lives in the johnbeardmore/oBeMS repository on GitHub; these links point at the commit this page was built from.
OBeMS: common questions
How big is the OBeMS PCB?
The OBeMS measures 180 × 120 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the OBeMS?
123 components, from 57 distinct parts. The full bill of materials is listed on this page.
Where can I download the OBeMS design files?
From the johnbeardmore/oBeMS repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the OBeMS design in my own project?
Yes, under the terms of its LGPL-3.0 license, which johnbeardmore chose for the repository.