Chronograph bracelet BLE 4.0

Im building a smart bracelet, its very simple its just an stopwatch


cc2540 or cc2541 module

5 blue leds

1 button


- You press button for 3s and it turns on. leds on.

- Then bluetooth waits to receive 2 hex values: value1 and value2

Value1 defines if the next value is max time or max laps

-If max time, next value the system will receive will be the max time of training. When this time is reached system enter to finish mode

-If max laps, next value system will receive will be max number of laps of training. when max laps is reached system enter to finish mode.

-After receiving the values system waits for another value(start value) or push the button. After this signal leds blinks 3s and stopwatch starts

-Once stopwatch started each time user presses the button is a new lap, and the system stores the time value for each lap and sends a signal trhough bluetooth. Each new lap leds blink 3s

- Like i said if stopwatch reaches max time or if reaches max number of laps enters to finish mode.

- Finish mode, leds all on. On finish mode system waits for 3s button to turn off. Lap time has to be stored with the date.

App connection

As you see the bracelet will connect with an app. I will design the app you just tell me wich values you need trough the bluetooth.

As you see the bracelet sends a signal each time, but the app could fail so thats the reason we need to store the lap values into the bracelet, because if we store we can sync the values later.

To sync the app with bracelet... once the bracelet is off. press 5 times the button and the bracelet enters into a config mode.

- if bracelet receives (syncvalue), has to answer with the values of each lap.

Leds extra feature...

When stopwatch is started leds blink 3s and then the leds on depending on the progress...

- for example if the bracelet received a max time of 10 minutes... every led will represent 2 minutes (10min/5leds)... so if the stopwatch is in minute 5 first 2 leds will be on 100% and 3rd led will be on 50%... so you need to use pwm.

- the same if the bracelet received max laps of 5 laps: each led will be 1 lap..

No extra mcu... you have to program into the cc2541 or cc2540 it already has builtin mcu.. please research

Evner: Elektronik, Indbygget Software, Fabrikation, Microcontroller

Se mere: PWM, led push button, cc2541, bracelet design, blink, BLE, lap, cc2541 ble, illustrate growth money savings account user presses button, BLE App, ble module, bluetooth cc2540, electronics bom, cc2541 bluetooth, cc2540 bluetooth, bluetooth example, bluetooth connection , received signal, bluetooth cc2541, simple led electronics, cc2540 user, bluetooth ble, bluetooth date time, ble electronics, bluetooth store

Om arbejdsgiveren:
( 32 bedømmelser ) Mexico

Projekt ID: #6020245

12 freelancere byder i gennemsnit $700 på dette job


Hi, I have 14 year experience in electronics, micro-controllers and system designing;if you are interested in my profile then give me a ping will discuss all things in details. About my self , you can review my pro Flere

$463 USD in 20 dage
(12 bedømmelser)

Dear Sir, We have completed several hardware and software project s using Ethernet, USB, Bluetooth, GSM and RF. Please see our profile for our past and current projects. We can do your project using CC2540 /CC2 Flere

$944 USD in 30 dage
(13 bedømmelser)

We are talented high-tech product designer team and we have many completed works which have been deployed to world around more than 100,000. Our talents include mixed signal hardware design, firmware design and coding Flere

$2000 USD in 30 dage
(2 bedømmelser)

I can do this in about 2 weeks. We will have stay in touch and communicate so we do it right with the smartphone app.

$444 USD in 14 dage
(2 bedømmelser)

Hello Sir, I am very much interested in this project since I have already developed TI's CC2540/41 BLE SoC. I can show you my past work. I have schematics,layouts which has designed by me. Please contac Flere

$166 USD in 3 dage
(4 bedømmelser)

hi... i can design this project with Altium Designer, i ll provide schematic, PCB, BOM and gerbers for producting.. i designed a circuit c2540 before for Beagle Bone Black thanks.

$277 USD in 3 dage
(7 bedømmelser)

hello, i am an electronics engineer and an embedded system designer with expertise in both analog and digital design. i also have good PCB design skills. i am qualified to work on this project. looking forward for you Flere

$1800 USD in 35 dage
(6 bedømmelser)

A proposal has not yet been provided

$150 USD in 4 dage
(1 bedømmelse)

Hi I can do this for you. Please check my actual works and you will see that i have just finished a BLE project which includes some of the features you want(PWM, Data transmission and Buttons). Please feel free to cont Flere

$400 USD in 25 dage
(1 bedømmelse)

Hi, I have read and understood the project guideline, so you can trust my sincere indulgence both in quality and time frame. I have done similar projects in the past. I will like to use my experience to serve you bet Flere

$294 USD in 3 dage
(0 bedømmelser)

Hi, My bid is so low because I don't have a HW so if you're not providing it than it would be 30$ + the cost of the HW ( [url removed, login to view] Flere

$35 USD in 7 dage
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Hi, We would like to work with you as we have finished some project using CC2540. The following is our brief introduction. If you have any questions, please give us your contact information and we will reply you asa Flere

$155 USD in 3 dage
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Dear sir/madam We are bangalore based company having fast experience in embedded software and hardware design and development, till now we completed around 68 design projects. our website address is http://ele Flere

$1666 USD in 45 dage
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A proposal has not yet been provided

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