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jotter

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@spatialexperiencegroup

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For fabricationGerbers, drill, pick-and-place and BOMGerbers and drill zip55 KBGerbers and drill zip: ATtiny841UnoTestShield28 KBGerbers and drill zip: Attiny85IR555_RevA14 KBGerbers and drill zip: ATtiny85UnoShield555_RevA25 KBGerbers and drill zip: DualAudioBreakout27 KBGerbers and drill zip: Jotter_RevA29 KBGerbers and drill zip: Jotter_RevB49 KBGerbers and drill zip: Jotter_RevD55 KBPick and place (CSV)2.9 KBPick and place (CSV): ATtiny841UnoTestShield1.3 KBPick and place (CSV): Attiny85IR555_RevA35 BPick and place (CSV): ATtiny85UnoShield555_RevA1.1 KBPick and place (CSV): DualAudioBreakout722 BPick and place (CSV): Jotter_RevA1.2 KBPick and place (CSV): Jotter_RevB2.7 KBPick and place (CSV): Jotter_RevD2.9 KBPCB BOM CSV (PCB SVG)1.9 KBPCB BOM CSV (PCB SVG: ATtiny841UnoTestShield)952 BPCB BOM CSV (PCB SVG: Attiny85IR555_RevA)50 BPCB BOM CSV (PCB SVG: ATtiny85UnoShield555_RevA)791 BPCB BOM CSV (PCB SVG: DualAudioBreakout)476 BPCB BOM CSV (PCB SVG: Jotter_RevA)808 BPCB BOM CSV (PCB SVG: Jotter_RevB)1.7 KBPCB BOM CSV (PCB SVG: Jotter_RevD)1.9 KB
3D modelThe board with its parts, for an enclosure (GLB)3D model (GLB)1.1 MB3D model (GLB): ATtiny841UnoTestShield1.3 MB3D model (GLB): ATtiny85UnoShield555_RevA955 KB3D model (GLB): DualAudioBreakout667 KB3D model (GLB): Jotter_RevA376 KB3D model (GLB): Jotter_RevB802 KB3D model (GLB): Jotter_RevD1.1 MB
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README

Jotter

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

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

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*

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

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
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