2 layers76.2 × 76.2 mm
2 layers76.2 × 76.2 mm
Jotter RevC
SpatialExperienceGroup/jotter- Size
- 76.2 × 76.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 47
- Nets
- 35
- Pads
- 258
- Tracks, vias
- 150, 0
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 8 Jul 2016
- Updated
- 10 May 2017
Overview
Jotter RevC is an open-source printed circuit board by SpatialExperienceGroup, from the SpatialExperienceGroup/jotter repository on GitHub, published under the MIT licence. It is a 2-layer board of 76.2 × 76.2 mm with 47 parts on 35 nets, routed with 150 tracks and 0 vias.
It is built around the ATTINY841-SSU, ATSAMD11D14A-MU and NRF24L01P-R, with the ABS25, DS3231S# and ESP8266-12E among its other parts. Its parts include 14 resistors, 13 ICs, 7 capacitors, 5 diodes and 4 connectors. It belongs with the ESP8266, AVR (ATmega, ATtiny) and SAM D and SAM boards of this library.
Main components
11
ATTINY841-SSU
SOIC-14-40℃~+85℃ 1.7V~5.5V 10bit 12 16MHz 512Byte 512Byte 8 Bit 8KB AVR Built-in FLASH SOIC-14 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
ATSAMD11D14A-MU
WQFN-24-EP(4x4)-40℃~+85℃ 1.62V~3.63V 10bit 12bit 16KB 22 32 Bit 48MHz 4KB ARM Cortex-M0+ Built-in FLASH Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、Built-in general-purpose timer、Hardware CRC、Programmable watchdog、Calendar function、Touch function WQFN-24-EP(4x4) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
NRF24L01P-R
QFN-20-EP(4x4)-40℃~+85℃ -82dBm 0dBm 1.9V~3.6V 11.3mA 13.5mA 2.4GHz 2.4GHz~2.525GHz 2Mbps ISM Power-on reset function、Supports RSSI function、CRC check function、Automatic response function、Automatic retransmission function SPI transceiver QFN-20-EP(4x4) RF Transceiver ICs ROHSNordic SemiconRF Transceiver ICsABS25
UncategorisedAbracon
DS3231S#
RTC, I²C, ±3.5ppm, SOIC16Maxim Integrated (Analog Devices)UncategorisedESP8266-12E
LCC-22P_16X24mmLCC-22P_16X24mm New Arrivals ROHSAi-ThinkerUncategorised
MCP73831
UncategorisedMicrochip Technology
PCF8563T/5
SO-8-40℃~+85℃ 0.25uA 1V~5.5V Battery low-voltage detection、Programmable clock output、Alarm function、Countdown timer I2C Yes SO-8 Real Time Clocks ROHSNXP SemiconductorsReal Time ClocksSPU0414HR5H-SB
SMDSMD New Arrivals ROHSKnowlesUncategorised
SPX3819S
--40℃~+85℃@(Ta) 1 16V 340mV@(500mA) 40uVrms 500mA 70dB@(100kHz) 90uA Fixed Over Current Protection、Over Temperature Protection、Reverse connection protection Positive - Voltage Regulators - Linear, Low Drop Out (LDO) RegulatorsSIPEXVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
README
README.mdJotter
Requirements
- micro usb port for charging and for updating firmware
- 3.7V from a lipo battery
- lipo charging circuitry through a micro usb port
- bluetooth low energy beacon receiver and transmitter for positioning and ideally multilateration
- MCU to handle bluetooth beacon code
- accurate real time clock
- sd card for storing data; consider storing the unit id number on the sd card
- mems microphone on front for capturing talking of others
- mems microphone on the back for capturing talking of user
- MCU for DFT processing of the audio signals
- IrDA or similar for transmitting and receiving unique IDs to identify users facing users
- MCU to handing IrDA
- accelerometer to identify leaning and sitting
- pressure sensor to identify sitting and standing, usually these are only accurate to within 1 meter, which might not be good enough
- Wi-Fi capability for updating firmware, changing settings, and downloading data
- Any LEDs? charging, Wi-Fi transmission
- Any Buttons? Wi-Fi mode
RTC
DS3231*
- Arduino Library: Rtc by Makuna, Sodaq_DS3231
DS3231SN
- has temperature compensated crystal oscillator (may need this for cold temps)
- TCXO:Yes
- Alamrs:2
- $9.97@1, digi-key
- $6.59@100, digi-key
- $2.50@10, aliexpress
Coin Cell Retainer/Holder
- Battery:CR2032
- Battery Diameter:20mm
BU2032
BU2032-1-HD-G
- Type:through hole holder
- $0.83@1, digi-key
- $0.69@100, digi-key
BU2032SM-HD-G
- Type:surface mount holder
- $0.87@1, digi-key
- $0.76@100, digi-key
BK-912
- Type:surface mount retainer
- Notes:easy replacement
- $0.33@1, digi-key
- $0.29@100, digi-key
BK-913*
- Type:through hole retainer
- Notes:easy replacement
- $0.35@1, digi-key
- $0.30@100, digi-key
BK-888
- Type:through hole retainer
- blocks inner side
- easy replacement
- $0.39@1, digi-key
- $0.33@100, digi-key
LDO
- Voltage 3.3V
- needed for running the esp8266 microprocessor and others
- ESP8266 typical -- Modem-Sleep is 15mA with not much load -- Wi-Fi Transmission could be up to 170mA, but it is unclear if this is an instantaneous load
AMS1117-3.3**
- Package:SOT-223
- Current: 1100mA
- Input Voltage: Up to 6V
- Dropout Voltage: 1100mV@800mA
- $1.58@50, aliexpress
SPX3819M5-L-3-3/TR**
- Package: SOT-23-5
- Current: 500mA
- Input Voltage: Up to 16V
- Dropout Voltage: 340mV@500mA
- $0.72@1, digi-key
- $0.49@100, digi-key
MCP1700T-3302E/TT
- Package: SOT-23-3
- Current: 250mA
- Input Voltage: Up to 6V
- Dropout Voltage: 178mV@250mA
- $0.37@1, digi-key
- $0.28@100, digi-key
TC1262-3.3VDBTR
- Package: SOT-223-3
- Current: 500mA
- Input Voltage: Up to 6V
- Dropout Voltage: 350mV@500mA
- $0.51@1, digi-key
- $0.39@100, digi-key
MIC5528-3.3YMY-TR
- Package: 6-UFDFN (1.2x1.2)
- Current: 525mA
- Input Voltage: 2.5V to 5.5V
- $0.19@1, digi-key
- $0.14@100, digi-key
NCP161AMX330TBG
- Package: 4-XDFN (1x1)
- Current: 450mA
- Input Voltage: 1.9V to 5.5V
- Dropout Voltage: 150mV@450mA
- $0.46@1, digi-key
- $0.22@100, digi-key
LiPo Battery
- 3.7V
100mAh
- Weight: 3g
- Size: 11.5mm x 31 x 3.8mm / 0.45" x 1.2" x 0.15"
- 4mA@24hr
- 10mA@10hr
- $5.95@1, Adafruit
- $4.76@100, Adafruit
150mAh
- Weight: 4.65g
- Size: 19.75mm x 26.02mm x 3.8mm / 0.77" x 1.02" x 0.14"
- 6mA@24hr
- 15mA@10hr
- $5.95@1, Adafruit
- $4.76@100, Adafruit
350mAh
- Weight: 7.9g
- Size: 36mm x 20mm x 5.6mm / 1.4" x 0.8" x 0.22"
- 14mA@24hr
- 35mA@10hr
- $6.95@1, Adafruit
- $5.56@100, Adafruit
500mAh**
- Weight: 10.5g
- Size: 29mm x 36mm x 4.75mm / 1.15" x 1.4" x 0.19" -- Little larger than a US Quarter
- 20mA@24hr
- 50mA@10hr
- $7.95@1, Adafruit
1200mAh*
- Weight: 23g
- Size: 34mm x 62mm x 5mm / 1.3" x 2.4" x 0.2"
- 50mA@24hr
- 120mA@10hr
- $9.95@1, Adafruit
2000mAh
- Weight: 34g
- Size: 60mm x 36mm x 7mm / 2.4" x 1.4" x 0.3"
- 83mA@24hr
- 200mA@10hr
- $12.50@1, Adafruit
- $10.00@100, Adafruit
2500mAh
- Weight: 52g
- Size: 2" x 2.55" x 0.30" (51mm x 65mm x 8mm)
- 104mA@24hr
- 250mA@10hr
- $14.95@1, Adafruit
- $11.96@100, Adafruit
LiPo Charger
MCP73831/2**
- Used by Adafruit
- Package: SOT-23-5
- Max Charge Current: 500mA
- Max Input Voltage: 6V
- $0.56@1, digi-key
- $0.42@100, digi-key
MAX1555EZK+T
- Package: SOT-23-5
- Max Charge Current: 340mA
- Max Input Voltage: 7V
- $2.03@1, digi-key
- $1.34@100, digi-key
MCU - Core
ATSAMD11
- USB: Yes
- VCC: 1.62V - 3.63V
- Current Consumption Idle: 1.8mA
- Current Consumption While: 3mA
- Current Consumption CoreMark: 4mA
- Program Memory: 16KB
- CPU Frequency: 48MHz
ATSAMD11C
- SERCOM: 2
ATSAMD11C14A
- Package: 14-SOIC
- $2.32@1, digi-key
- $1.69@100, digi-key
ATSAMD11D
- SERCOM: 3
ATSAMD11D14A
ATSAMD11D14A-SSUT**
- Package: 20-SOIC
- $2.54@1, digi-key
- $1.85@100, digi-key
ATSAMD11D14A-MUT*
- Package: 24-QFN (4x4)
- $2.65@1, digi-key
- $1.93@100, digi-key
ATSAMD21
- USB: Yes
- VCC: 1.62V - 3.63V
- Current Consumption Idle: 2.2mA
- Current Consumption While: 4mA
- Current Consumption CoreMark: 7mA
- Program Memory: 32/64/128/256KB
- CPU Frequency: 48MHz
- I2S: Yes
ATSAMD21E
- SERCOM:4
- ADC:10
ATSAMD21E18A
- Program Memory: 256KB
ATSAMD21E18A-MUT
- Package:32-VFQFN
- $5.30@1, digi-key
- $3.88@100, digi-key
ATSAMD21E15B-AUT
- Package:32-TQFP (7x7)
- $3.16@1, digi-key
- $2.32@100, digi-key
ATSAMD21G
- SERCOM:6
- ADC:14
ATSAMD21J
- SERCOM:6
- ADC:20
LPGA
- Custom Reprogrammable Circuit Design
ICE40LP384-SG32
- Package: 32-QFN
- LABS/CLBs: 48
- Logic Elements: 384
- Dev Kit http://www.latticestore.com/searchresults/tabid/463/searchid/1/searchvalue/ice40hx1k-blink-evn/default.aspx
- $1.67@1, digi-key
- $1.38@100, digi-key
MCU - IrDA, Bluetooth
ATtiny85
- GCC Architecture: avr25
- Program Memory: 8KB
- TWI: 0
- SPI: 0
- USART: 0
- ADC: 4x10b
ATTINY85-20SU
- Package: 8-SOIC
- CPU Frequency: 20MHz
- $2.24@1, digi-key
- $1.63@100, digi-key
ATTINY85-20MUR
- Package: 20-QFN (4x4)
- CPU Frequency: 20MHz
- $2.08@1, digi-key
- $1.51@100, digi-key
ATtiny841
- Program Memory: 8KB
- GCC Architecture: avr25
- CPU Frequency: 16MHz
- TWI: 1 Slave
- SPI: 1
- USART: 2
ATTINY841-SSUR**
- Package: 14-SOIC
- $2.11@1, digi-key
- $1.53@100, digi-key
ATTINY841-MUR*
- Package: 20-QFN (4x4)
- $2.16@1, digi-key
- $1.56@100, digi-key
ATTINY841-MMHR
- Package: 20-VQFN (3x3)
- $2.32@1, digi-key
- $1.68@100, digi-key
ATtiny88
- Program Memory: 8KB
- GCC Architecture: avr25
- CPU Frequency: 12MHz
- TWI: 1
- SPI: 1
- USART: 0
ATTINY88-MU
- Package: 32-VQFN (5x5)
- $1.82@1, digi-key
- $1.32@100, digi-key
ATTINY88-AU
- Package: 32-TQFP (7x7)
- $1.96@1, digi-key
- $1.42@100, digi-key
ATtiny40
- Program Memory: 4KB
- GCC Architecture: avrtiny10
- CPU Frequency: 12MHz
- TWI: 1 Slave
- SPI: 1
- USART: 0
ATTINY40-MMHR
- Package: 20-VQFN (3x3)
- $1.49@1, digi-key
- $1.09@100, digi-key
ATTINY40-XUR
- Package: 20-TSSOP
- $2.20@1, digi-key
- $1.60@100, digi-key
ATTINY40-SUR
- Package: 20-SOIC
- $2.14@1, digi-key
- $1.55@100, digi-key
ATtiny828
- Program Memory: 8KB
- GCC Architecture: avr25
- CPU Frequency: 20MHz
- TWI: 1 Slave
- SPI: 1
- USART: 1
ATTINY828-AUR
- Package: 32-TQFP (7x7)
- $2.45@1, digi-key
- $1.78@100, digi-key
ATTINY828-MUR
- Package: 32-VQFN (5x5)
- $2.67@1, digi-key
- $1.94@100, digi-key
MEMS Microphones
- I2S digital input type
- Sensitivity: http://www.analog.com/en/analog-dialogue/articles/understanding-microphone-sensitivity.html -- In near-field applications, such as cell phones, where the microphone is close to the sound source, a microphone with higher sensitivity is more likely to reach the maximum acoustic input, clip, and cause distortion. On the other hand, a higher sensitivity may be desirable in far-field applications, such as conference phones and security cameras, where the sound is attenuated as the distance from the source to the microphone increases. -- Normal Conversation at 1m is around 63dB SPL
SPH0645LM4H-B*
- Port: Bottom
- Frequency Range: 20Hz to 20kHz
- Sensitivity: -26dB ±3dB @ 94dB SPL
- SNR: 65dB(A)
- Supply Volgage: 1.62V to 1.8V to 3.6V
- Supply Current: 0.6mA
- Precision: 18-bit (6 additional bits are zeros, making 24-bit total)
- $3.06@1, digi-key
- $2.29@1, mouser
- $1.90@100, digi-key
- $1.51@100, mouser
ICS-43432
- Port: Bottom
- Frequency Range: 50Hz to 20kHz
- Sensitivity: -26dB ±1dB @ 94dB SPL
- SNR: 65dB(A)
- Supply Volgage: 1.62V to 1.8V to 3.6V
- Supply Current: 1.5mA
- Precision: 24-bit
- $3.18@1, digi-key
- $2.15@100, digi-key
- example circuit: https://www.tindie.com/products/onehorse/ics43432-i2s-digital-microphone/
- Library: https://github.com/nodae/teensy_i2s_experimental
INMP441ACEZ-R7
- Port: Bottom
- Frequency Range: 60Hz to 15kHz
- Sensitivity: -26dB ±3dB @ 94dB SPL
- SNR: 61dB(A)
- Supply Volgage: 1.62V to 1.8V to 3.6V
- Supply Current: 1.6mA
- Precision: 24-bit
- $4.35@1, digi-key
- $3.14@100, digi-key
SPU0414HR5H
- Output Type: Analog
- Port: Top
- Frequency Range: 100Hz to 10kHz
- Sensitivity: -22dB ±3dB @ 94dB SPL
- SNR: 59dB(A)
- Supply Volgage: 1.5V to 3.6V
- Supply Current: 0.22mA
- $2.01@1, digi-key
- $1.10@100, digi-key
- $1.87@1, mouser
- $1.03@100, mouser
SPW2430HR5H-B
- Output Type: Analog
- Port: Top
- Frequency Range: 100Hz to 10kHz
- Sensitivity: -42dB ±3dB @ 94dB SPL (not good)
- SNR: 59dB(A)
- Supply Volgage: 1.5V to 3.6V
- Supply Current: 0.11mA
- $1.11@1, digi-key
- $0.60@100, digi-key
- $1.04@1, mouser
- $0.59@100, mouser
MCU - DFT Audio Signal Processor
- Interface: I2S
ESP8266*
- Wi-Fi:Yes
- Allows us to have a Wi-Fi interface for setting the time and other settings.
- VCC:3.3V
- Runs on 3.3V, so should have an LDO or similar to bring down the 5V supply.
- pin mapping: http://www.esp8266.com/wiki/doku.php?id=esp8266_gpio_pin_allocations
- Has I2S inputs for digital audio of Left and Right microphones
- Peak Current Consumption on Startup: 320mA (use 470uF SMD)
- Current Consumption Idle: 15mA
- Current Consumption Wi-Fi Receive: 70mA
- Current Consumption Wi-Fi Transmit: <170mA
- I2S Forum: http://www.esp8266.com/viewtopic.php?f=13&t=7404
- I2S Example Code: https://github.com/cnlohr/esp8266duplexi2s
- DFT Example Code: https://github.com/cnlohr/channel3
ATSAMD21
ATSAMD21E18A-MUT
- Package:32-VFQFN
- $5.30@1, digi-key
- $3.88@100, digi-key
ATSAMD21E15B-AUT
- Package:32-TQFP (7x7)
- $3.16@1, digi-key
- $2.32@100, digi-key
IrDA Transciever
- http://www.societyofrobots.com/electronics_irda_tutorial.shtml
- Modulation Frequency: 38KHz
- most single packages are expensive, so we split into two parts
- may need to offload processing to small chip like Attiny85
IrDA Sensor Pair
IrDA Processor
- Encoder/Decoder
ATtiny MCU
MCP2155
MCP2122
IrDA Receiver
VS1838B
TSOP38238
TSOP4038
TSOP4838
HS0038B
TSOP58238
TSOP6238TR
TSMP77000TT
- Distance: 5m
- Voltage Supply: 2.5V to 5.5V
- $1.66@1, digi-key
- $1.21@100, digi-key
IrDA Transmitter
- Can be controlled with a 555 timer or an MCU
ATtiny MCU
NE555
- Supply Voltage: Typically 5V operation
- Max Frequency: 1MHz
TLC555
- Supply Voltage: 2V-15V
- Temperature Range: 0C to +70C
- Package: 8-SOIC
- Max Frequency: 2.1MHz
- $0.72@1, digi-key
- $0.48@100, digi-key
ICM7555
- Supply Voltage: 2V-18V
- Drop in replacement for NE555
- Max Frequency: 1MHz
ICM7555CBAZ
- Package: 8-SOIC
- Temperature Range: 0C to +70C
- $0.73@1, digi-key
- $0.50@100, digi-key
ICM7555IBAZ
- Package: 8-SOIC
- Temperature Range: -25C to +85C
- $0.73@1, digi-key
- $0.50@100, digi-key
IMU
- need to detect sitting vs standing
- may include accelerometer, gyro, barometer, and perhaps magnetometer; why not
MPU9250
- DoF:9
Environmental Sensor
BMP280
Bluetooth Module for Beacon
nRF24L01+*
- Chipset: nRF24L01
- FCC Certified: No
MDBT40P**
- Chipset:nrf51822
- FCC Certified: Yes, SH6MDBT40
Parts
47| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10K | Resistors_SMD:R_1206 | R2, R9, R10, R11, R13 |
| 4 | 0 | Resistors_SMD:R_1206 | R4, R5, R6, R8 |
| 3 | 10uF | Capacitors_SMD:C_1206 | C1, C4, C5 |
| 3 | 1K | Resistors_SMD:R_1206 | R1, R12, R14 |
| 3 | D_Schottky | Diodes_SMD:SOD-123 | D2, D3, D4 |
| 2 | ABS25 | Crystals:Crystal_SMD_0603_4Pads | U3, U5 |
| 2 | ATTINY841-SSU | Housings_SOIC:SOIC-14_3.9x8.7mm_Pitch1.27mm | IC1, IC2 |
| 2 | BSS138 | TO_SOT_Packages_SMD:SOT-23 | Q1, Q2 |
| 2 | C | Capacitors_SMD:C_0805 | C2, C3 |
| 2 | LED | LEDs:LED-0805 | D1, D5 |
| 1 | 0 | Resistors_SMD:R_2010 | R7 |
| 1 | 100K | Resistors_SMD:R_1206 | R3 |
| 1 | 1uF | Capacitors_SMD:C_1206 | C6 |
| 1 | 2.2uF | Capacitors_SMD:C_1206 | C7 |
| 1 | ATSAMD11D14A | Housings_SOIC:SOIC-20_7.5x12.8mm_Pitch1.27mm | U1 |
| 1 | CONN_01X02 | Pin_Headers:Pin_Header_Straight_1x02 | P3 |
| 1 | CONN_01X02 | MyKiCadParts:JST-S2B-PH-SM4 | P2 |
| 1 | DS3231 | MyKiCadParts:SOIC-16-W-80 | U9 |
| 1 | ESP8266-12E | MyKiCadParts:ESP8266-12E-80 | U11 |
| 1 | MCP73831 | MyKiCadParts:SOT-23-5-80 | U2 |
| 1 | NRF24L01+ | MyKiCadParts:NRF24L01+ | U7 |
| 1 | PCF8563T | MyKiCadParts:SO-08-N-80 | U6 |
| 1 | SD_Card | MyKiCadParts:DM3D-SF-80 | CON1 |
| 1 | SPST | Buttons_Switches_SMD:SW_SPST_EVQP7A | SW1 |
| 1 | SPU0414HR5H | MyKiCadParts:SPU0414HR5H-SB | U8 |
| 1 | SPX3819 | MyKiCadParts:SOT-23-5-80 | U4 |
| 1 | USB_A | Connect:USB_A | P1 |
| 1 | VS18388 | Pin_Headers:Pin_Header_Angled_1x03 | U10 |
The 46 most common of 47 parts.
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Questions
How big is the Jotter RevC PCB?
It measures 76.2 × 76.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Jotter RevC use?
47 parts, built around the ATTINY841-SSU, ATSAMD11D14A-MU, NRF24L01P-R and ABS25. 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 Jotter RevC KiCad files?
From the SpatialExperienceGroup/jotter repository on GitHub, at the commit this page was made from: the board is Hardware/Jotter_RevC/Jotter_RevC.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Jotter RevC design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).