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PWS SPECIFICATIONS 1

PROGRAMMABLE WIRELESS STAMP (PWS) – USER MANUAL

TABLE OF CONTENTS

Overview ................................................................................................................................................... 2

High Level Features ................................................................................................................................... 6

Operating Parameters ............................................................................................................................... 7

Pinout and Terminal Descriptions ............................................................................................................. 8

Physical Dimensions .................................................................................................................................. 9

Recommended Operating Conditions .................................................................................................... 10

Battery Charger Characteristics .............................................................................................................. 10

Battery Charger with Load Sharing Mode ............................................................................................... 10

Power Consumption (WROOM-02 Module) ........................................................................................... 11

Onboard LEDs .......................................................................................................................................... 11

Schematics .............................................................................................................................................. 12

Power and Charger Circuit .................................................................................................................. 12

Real Time Clock (RTC) Circuit .............................................................................................................. 13

USB to Serial Circuit ............................................................................................................................ 13

ESP-WROOM-02 Circuit ...................................................................................................................... 14

GPIO and Connector Circuit ................................................................................................................ 15

Important Information ............................................................................................................................ 17



OVERVIEW

The Programmable Wireless Stamp (PWS) is a low cost micro-controller based wireless board tailored to

general test and measurement, wireless data acquisition and IoT applications. The PWS is based off of the ESP-

WROOM-02, a high performance wireless SOC by Espressif, especially designed for space and power constrained

wireless data acquisition and IoT applications.

At the heart of the ESP-WROOM-02 SOC is the ESP8266EX chip. A 32-bit Arduino Compatible low power

micro-controller with CPU clock of 80MHz, 50KB of user available RAM and an external 4MB of Flash memory.

Programmable Wireless Stamp Rev.A

The Programmable Wireless Stamp include a general purpose I/O connector for direct sensor connectivity

as well as three PMOD connectors, one I2C, one SPI, and one UART/GPIO for plug and play I/O extension and

utilization of the growing ecosystem of PMOD signal conditioning modules.

The PMOD is a standard created by Digilent and allows for precision data conversion, high-accuracy

timekeeping, precision analog generation as well as advanced application specific functionality such as ambient-

light sensing, capacity sensing and many others to have a common communication interface within a system.

The PWS augments that functionality by allowing, programmability and decision making in real time as

well as wireless connectivity to the data produced by these peripheral modules.

http://espressif.com/en/products/wroom/

http://espressif.com/en/products/wroom/

http://espressif.com/en/products/esp8266/

https://en.wikipedia.org/wiki/Pmod_Interface



Digilent, the creator of the standard, offers a slew of PMOD modules that can be purchased off the shelf.

These modules can be plugged directly to the PWS board for the creation of powerful real time wireless data

acquisition and Internet of Things applications.

Reference (http://digilentinc.com/Products/Catalog.cfm?NavPath=2,401&Cat=9)

The PMOD ecosystem is expanding rapidly. Companies like Maxim and Analog Devices have created

several reference designs that are offered to the community via PMOD modules. Maxim, for example, offers a

wide variety of analog, mixed-signal and sensor PMOD modules.



Maxim PMOD Modules (https://www.maximintegrated.com/en/design/design-technology/fpga-design-

resources/pmod-compatible-plug-in-peripheral-modules.html)

Analog Devices offer a great variety of ADC and DAC PMOD modules. Analog Devices is the vendor that

supplies National Instruments with the ADC and DAC chips that are part of National Instruments data acquisition

devices.

Pmods™ by Analog Devices

The Stamp can be powered by an external Lithium Polymer battery for standalone operation. It also

includes battery charger capability and constantly monitors its battery health status, generating user notifications

messages when it is time for battery charging. Battery charging can be accomplished by simply plugging the

PWS on a computer USB port.

A SD Card can be inserted in the Stamp’ SD Card connector for local data logging. The HW includes a Real

Time Clock (RTC) for time stamped sensor data acquisition and data logging.

The Programmable Wireless Stamp firmware can be programmed in either C-language via utilization of the

Arduino IDE or in National Instruments LabVIEW. A full set of LabVIEW API VIs is made available for easy access to

the Stamp peripherals in LabVIEW. Two LabVIEW Templates are also provided to jump start your IoT and wireless

data acquisition applications.

https://www.maximintegrated.com/en/design/design-technology/fpga-design-resources/pmod-compatible-plug-in-peripheral-modules.html

https://www.maximintegrated.com/en/design/design-technology/fpga-design-resources/pmod-compatible-plug-in-peripheral-modules.html



If LabVIEW is the language of choice for the programming of the Programmable Wireless Stamp firmware,

the user will need to acquire the Arduino Compatible Compiler for LabVIEW by TSXperts-Aledyne. Through the

utilization of the Arduino Compatible Compiler for LabVIEW, users can deploy LabVIEW code via USB cable to run

embedded and standalone in the Stamp. This programming capability allows the user to create fully custom

solutions from scratch or to extend and tailor the shipping examples and data logging applications to fit your

specific project requirements.

The Programmable Wireless Stamp is ideally suited for the following applications:

Low-power remote data logging

Low-power remote monitoring and control

IoT (Internet of Things) application

Distributed embedded monitoring and control

http://www.tsxperts.com/arduino-compiler-for-labview/



Wireless data acquisition

HIGH LEVEL FEATURES

ESP-WROOM-02 WiFi Module : MCU 32-bit 80MHz Integrated TCP/IP protocol stack

Flash Memory 4 MB with User RAM 50 KB (SRAM)

WiFI 802.11b/g/n at 2.4 GHz support WPA/WPA2

Integrated WEP, TKIP, AES, and WAPI engines

+19.5dBm output power in 802.11b mode

FCC, CE, TELEC, Wi-Fi Alliance, and SRRC certified for WROOM-02 Module

Supported Battery: Li-Po single cell, 3.7V, 500mAh minimum.

Micro SD Card Socket

Real-Time Clock (RTC)

USB for Power/Programming (Speed up-to 921600)

One I2C-Pmod™ Connector (Pmod™ Interface I2C)

One SPI-Pmod™ Connector (Pmod™ Interface Type 2 SPI)

One UART/GPIO-- Pmod™ Connector (Pmod™ Interface Type 4 UART, Type 1 GPIO)

ESD Protection circuit for all GPIOs (Complies with IEC61000-4-2 level 4, MIL STD 883C-Method 3015-6:

class 3)

Operating temperature range -20C to +55C

Input Voltage, Battery holder (Li-Po single cell): 3.4V-4.2 V (Typ. 3.7V)

Input Voltage: Micro USB: 5V

Circuit Operating Voltage: 3.3V

DC Current per I/O Pin: 12mA (max)

Operating Current (Average) = 80 mA

PWS Block Diagram



OPERATING PARAMETERS

Table 1 below describes the major parameters

Table 1 Parameters

Categories Items Values

WiFi Parameters

Certificates FCC/CE/TELEC

WiFi Protocols 802.11 b/g/n

Frequency Range 2.4GHz-2.5GHz (2400M-2483.5M)

Hardware Parameters

Connectors

Micro USB for Program/Power

JST single cell Li-Po Battery connector (Charged via USB)

4-pinx2 I2C-Pmod™Interface

6-pin SPI-Pmod™ Interface Type 2

6-pin UART/GPIO- Pmod™ Interface Type 4 UART, Type 1 GPIO

LEDs

Power: Blue

Li-Po Battery Charge: Red

UART TX: Blue, RX: Red

User (GPIO16) : Green

Input Voltage (Battery holder) 3.4 to 4.2 V (Typ. 3.7V)

Operating Voltage (VDD) 3.3V

Operating Current (Average value) 80mA

Operating Current (Standby value) 1mA

Operating Temperature Range -20° to +55°

Ambient Temperature Range Normal temperature

Package Size 62.74mm*48.10mm*7mm

Software Parameters

Wi-Fi mode Station/SoftAP/SoftAP+Station

Security WPA/WPA2

Encryption WEP/TKIP/AES

Firmware Upgrade UART Download (USB Port)

Software Development Arduino IDE (ESP8266) /LabVIEW & Arduino Compatible Compiler for LabVIEW toolkit for firmware development

Espressif's Smart Config Esptouch Apps for ESP8266



PINOUT AND TERMINAL DESCRIPTIONS

There are altogether 15 pin counts, the definitions of which are described in Table 2 below.

Table 2 Pin Descriptions

No.

Pin/Connector WROOM-02 Pin Functions

1 VCC VCC 3.3V power supply (VDD)

2 GND GND GND

3 SPI#1 -SS GPIO5 SPI CS pin, GPIO,PWM

4 SPI#2 -MOSI GPIO13 SPI MOSI pin, GPIO,PWM

5 SPI#3 -MISO GPIO12 SPI MISO pin, GPIO,PWM

6 SPI#4 -SCLK GPIO14 SPI SCLK pin, GPIO,PWM,(Pull-up)

7 UART/GPIO#1 -GPIO15 GPIO15 GPIO, PWM, (Pull-down)

8 UART/GPIO#2 -TXD GPIO1 UART/GPIO, TXD,PWM

9 UART/GPIO#3 -RXD GPIO3 UART/GPIO, RXD,PWM

10 UART/GPIO#4 -GPIO16 GPIO16 GPIO, Onboard LED (Green), can be used to wake up the chipset from deep sleep mode

11 I2C#1 -SCLK GPIO14 I2C SCLK pin, GPIO,PWM , (Pull-up) (*shared SCLK pin with SPI interface)

12 I2C#2 –SDA GPIO2 I2C SDA pin, GPIO,PWM , (Pull-up)

13 SW (FPROM) GPIO0 Digital Input Pin, Smart Config enter pin, (Pull-up)

14 ADC0 TOUT (GPIO17)* 10-bit ADC connected to VBAT_CHG, integrates a voltage divider to allows the input to be between 0V and 4.2V for monitoring Li-Po battery status (refer schematic)

15 SD Card: CS GPIO4 SD Card Chip Select Pin (refer schematic)

GPIO0-GPIO15 can be INPUT, OUTPUT, INPUT_PULLUP, and INPUT_PULLDOWN.

GPIO16 can be INPUT, OUTPUT or INPUT_PULLDOWN. It is also XPD for deepSleep.

Pin Interrupts may be attached to any GPIO pin, except GPIO16.

PWM may be used on pins 0 to 15. The value may be in range from 0 to 1023. Since the ADC is 10-bit

resolution; 1023 is 100% duty cycle.

*The ADC cannot be used when the chip is transmitting. Otherwise the voltage may be inaccurate.



Figure PWS Pinout Graphical Diagram

PHYSICAL DIMENSIONS

Table 3 Dimension

Length Width Height

62.74mm 48.10mm 7mm

Figure Dimension



RECOMMENDED OPERATING CONDITIONS

Table Recommended Operating Conditions

Operating Condition Min Typ Max Unit

Operating Temperature -20 20 55 ℃

Input Voltage (Battery holder) 3.4 3.7 4.2 V

Operating voltage (VDD) 3.0 3.3 3.6 V

BATTERY CHARGER CHARACTERISTICS

DC Characteristics

Parameters Min Typ. Max Units

Charger Voltage (Constant-Voltage Mode)

4.168 4.2 4.232 V

Charger Current (Fast Charge Constant-Current Mode)

450 505 550 mA

Complete Charge Cycle (1000 mAh Li-Ion Battery)*

- - 240 minutes

* Li-Po batteries are charged at 4.2V with fast charge current at 500mA, the preferred fast

charge current for Lithium-Ion cells is at the 1C rate, with an absolute maximum current at the

2C rate. For example, a 500 mAh battery pack has a preferred fast charge current of 500 mA.

This means that the MINIMUM capacity of the Li-Po battery shall be 500 mAh. Smaller cells

will be damaged by this current and may overheat, develop internal gasses and explode;

therefore generating a safety hazard. We strongly recommend that you select a Li-Po battery

of at least 500mAh capacity (preferred 1000mAh). A bigger cell will take more time to charge,

but won't be harmed or overheated.

BATTERY CHARGER WITH LOAD SHARING MODE

The PWS includes a Li-Po charge circuit with load sharing mode that allows the PWS to charge the Li-Po

battery while running on USB 5V power.



Figure Load Sharing (Power Supply+ Battery Charger)

POWER CONSUMPTION (WROOM-02 MODULE)

Table Power Consumption

Parameters Min Typical Max Unit

Tx802.11b, CCK 11Mbps, P OUT=+17dBm 170 mA

Tx 802.11g, OFDM 54Mbps, P OUT =+15dBm 140 mA

Tx 802.11n, MCS7, P OUT =+13dBm 120 mA

Rx 802.11b, 1024 bytes packet length , -80dBm 50 mA

Rx 802.11g, 1024 bytes packet length, -70dBm 56 mA

Rx 802.11n, 1024 bytes packet length, -65dBm 56 mA

Modem-Sleep 15 mA

Light-Sleep 0.9 mA

Deep-Sleep 10 uA

ONBOARD LEDS

+5V (VDD-USB) +4.2 V

VBAT_CHG

+3.3V (VDD)



Onboard LEDs

SCHEMATICS

POWER AND CHARGER CIRCUIT



REAL TIME CLOCK (RTC) CIRCUIT

USB TO SERIAL CIRCUIT



ESP-WROOM-02 CIRCUIT



GPIO AND CONNECTOR CIRCUIT



IMPORTANT INFORMATION

THE UTILIZATION OF THE PROGRAMMABLE WIRELESS STAMPS MATERIALS BIND THE USER TO THE FULL TERMS

OF THE PROGRAMMABLE WIRELESS STAMP LICENSE AGREEMENT.

REFER TO THE PROGRAMMABLE WIRELESS STAMP LICENSE AGREEMENT DOCUMENT.

TSXperts LLC-QWAVE SYSTEMS MAKE NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE

INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS.

© 2015 TSXperts/Q-wave Systems. All Rights Reserved.

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