Bracelet Edition

• Compatibility
• Use cases
• Disclaimer
• Bill of materials
• Quick start
• Settings
• Buttons
• Battery life
• Optional equipment
• Links

Bracelet Edition is a variant of SoftRF DIY GA proximity awareness device been implemented in a small, lightweight wristband form factor.

It is supposed to require minimal skills from a builder to begin with and gives an opportunity to evaluate if the SoftRF technology is appropriate for your needs.

The Bracelet is based upon a partner's hardware - TTGO T-Impulse board, which is available for direct purchase from manufacturer at more or less reasonable price (30+ USD).

T-Impulse is:

• a multipurpose ,
• DIY-friendly ,
• low power ,
• lightweight

- LoRaWAN wristband with GNSS receiver and 9DOF sensor.

The board's design is a joint development of both LilyGO® company and SoftRF project.

The T-Impulse is an example of cutting edge technology. It contains (some of the most popular):

• STMicroelectronics STM32L073Z Low Power MCU ;
• Semtech SX127x Long Range Low Power RF Transceiver ;
• Sony CXD5603GF Low Power GNSS Receiver ;
• TDK InvenSense ICM-20948 Inertial Measurement Unit ;
• 0.49" I²C OLED display

Compatibility ¹

Type	Protocol	FLARM	OGN tracker	PilotAware	Skytraxx	SoftRF
Radio	FLARM AIR V6
	OGNTP
	P3I
	FANET+
Data	FLARM NMEA
	Garmin GDL90
	Dump1090

¹ - it is necessary for a reader to distinguish the difference between statement "compatible" and statement "fully compatible".
     SoftRF implements only a reasonable minimum of the protocols specs. No "bells and whistles" so far.

Disclaimer

SoftRF firmware for Bracelet Edition is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Author of SoftRF firmware:

• will reject any hardware related claims associated with TTGO T-Impulse wristband. Ask for support from seller or manufacturer ;
• reserves the right to suspend or terminate support of TTGO T-Impulse in the firmware at any time.

For the time being ( Sep '21 ) there were no critical hardware issues reported for current version of the T-Impulse wristband. However things my change over the time...
If you have issues with bringing up your new TTGO T-Impulse or just not happy with the device - be prepared to execute your Purchase Protection plan.

Bill of materials

Required

Number	Part	Qty	Picture	Source
1	LilyGO® T-Impulse 2	1		AliExpress

² - 868 MHz variant is applicable for these world regions: EU, RU, NZ, SA, IN ;
     915 MHz - US, CA, AU, IL, KR ;
     433 MHz - CN .

NOTICE: Use comments area of your order to ask seller if they can pre-install SoftRF firmware into your T-Impulse wristband(s) before shipping.

Optional

Number	Part	Qty	Picture	Source
1	SMA female to uFL adapter	1		AliExpress
2	Antenna 868 MHz 3	1		AliExpress
3	Antenna 868 MHz 3	1		EBay AliExpress 1 2
4	868 MHz SMA dipole antenna 3	1		AliExpress
5	micro-USB or Type-C OTG adapter	1		AliExpress

³ - 868 MHz variant is applicable for these world regions: EU, RU, NZ, SA, IN ;
     915 MHz - US, CA, AU, IL, KR ;
     433 MHz - CN .

Quick start

Use these instructions to start operating with your delivered Bracelet device.

Settings

The T-Impulse wristband comes with a Type-C USB cable that is applicable to alter the device configuration.

Procedure of settings change is explained here.
Settings description is located there.

If you are an application developer and you think about to add the Bracelet configuration menu into your software, please, use:

• C/C++ header file and
• example of usage (in SkyWatch)

Buttons

Touch button function

When unit is Off:

• touch and release Touch button to turn the unit On.

When unit is On:

• touch and release Touch button to cycle between display view modes, or
• touch and keep holding Touch button for 2-3 seconds to turn the unit Off.

Reset button function

• press and release Reset button one time to restart the SoftRF unit.

Boot button function

• press and keep holding Reset button, then
• press and keep holding Boot button, then
• release Reset button, then
• release Boot button, to enter the device into programming mode.

Battery life

Current consumption from 3.7 Volt battery:

Mode	Average current
Active receive OFF	25 mA
Active receive ON	35 mA
Sleep	0.1 mA

Operating time from a full charge depends on your actual battery capacity.

Optional equipment

1. SoftRF Badge Edition is a companion device for the Bracelet.

Additional information on T-Impulse wristband

1. LilyGO® T-Impulse product support pages on GitHub
2. touch sensor function video