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Zodiak1993

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Posts posted by Zodiak1993

    DIY Bluetooth Interface for ProChrono Digital

    in Chronograph Equipment & Techniques

    Posted · Edited by Zodiak1993

    So here are some more pictures, of my Chrony (version 2 ).

    h8lg6z75.jpg

    I used an old wlan-antenna of my d-link router to increase the effective range. Its no problem to connect with the Chrony over 100m but if I am using the original software from competition electronics it doesn't work over 30-40m. The reason why this happens is pretty simple. The software is sending several commands in one second and the Chrony returns the last recorded velocity in a string (you already have talked about it here). If the distance is too far the BT-connection is too slow and there is a kind of buffer overflow...

    Unfortunately I am not good at coding, and can't change it. If there would be just one command per second from the software I think it would work over 100m. I already tried to send the commands via Hyperterminal and it was no problem (distance 100m).

    So the next step is, to create a new software with metric units :) But therefore I have to get better in coding.

    44p4fj54.jpg

    nyk33e6z.jpg

    pudgbhq2.jpg

    With this picture I just want to show you that the battery is chargeable during operation. So there will be never the case, that I cant measure my guns :)

    Thank you for your attention.

    Johannes

    DIY Bluetooth Interface for ProChrono Digital

    in Chronograph Equipment & Techniques

    Posted · Edited by Zodiak1993

    Thank you very much :) It really was a lot of work, and there were so many problems that had to be fixed. So on the pictures you can see my "version 1" (for my friend :D). I changend some things in "version 2" for example the undervoltage shutoff. Version 1 needs 1.5mA, Version 2 needs 0.007mA (if battery voltage is too low). So it would be no problem to forget to turn off the Chrony over a month.

    Also version 1 has a delay of about 1 second if you turn it off. Version 2 is instant off. But of course version 1 is also working fine, there were just little improvements in version 2.

    I will show you some more pictures tommorow.

    And thank you M852 for this thread, it was my first experience with bluetooth TTL - I wouldn't have done it without you :bow:

    DIY Bluetooth Interface for ProChrono Digital

    in Chronograph Equipment & Techniques

    Posted · Edited by Zodiak1993

    So at first i want to introduce myself, I am from Germany and I am a 21 year old electronic-student. So please don't be too hard to me, because English is not my main language and i haven't used my English for a long time, but i think you will understand me :)

    I'm very thankful for this thread, because it was the primary idea for my project and without this thread, I wouldn't have done it!

    I bought the Chrony half a year ago and it didn't worked indoor because of the light. So I decided to build my own lighting, but it didn't worked and looked very well. That was the reason to buy the original lighting system (about 65€). After 2 weeks the lighting system arrived and I had to observe that the transformer is working with 110V not with 230V. I know there are adapters but I didn't want to use one.

    So my idea was to provide the Chrony and the lighting system with a Lipo-Battery (18.5V, 5000mah).

    After searching via google I found this site, and saw that there is a way to use a bluetooth connection...okay a lot of input... . After three days of thinking I knew what i have to do:

    Here are my requirements:

    - Using a battery (runtime over 10h)

    - Undervoltage Shutoff (if you forget to turn the Chrony off)

    - Voltage Indicator via Duo-Led (Green, Orange, Red)

    - Bluetooth with range >50m

    - Chargeable without effort

    - "Clean" optic (It should not look unprofessional)

    So let's start with some pictures:

    ld4oahsf.jpg

    Here you can see two Bluetooth modules (BTM222 - maximum range 100m) and 4 Step-Down Converters (Pololu 9V and 5V). Don't wonder yourself, i am building two Chrony's :) (for me and a friend of mine)

    So that is the inside of the Chrony, i have used hot glue to hold the connector in place. The connector is used to charge the Chrony. The eight pins of the connector are used for plus,minus and six of them are used for balancing the individual cells.

    fuyg7mq3.jpg

    452uowu5.jpg

    Here you can see the loading cable:

    yalgb5ob.jpg

    And the charger from ebay for 30€.

    viqgrx9n.jpg

    I have used the following battery.

    T5000-5-20.jpg

    Turnigy 18.5V 5000mAh (35€)

    I wanted to provide the lighting system with voltage over the rods. But at first let me show you some pictures.

    Here ("plastic thing") are the short brass jacks in it. The wires are soldered with the brass jacks.

    http://fs1.directupload.net/images/141228/oc6ply4k.jpg

    long&short brass jacks and two "connectors"

    http://fs1.directupload.net/images/141228/pisr2dnm.jpg

    It fit's well :)

    http://fs2.directupload.net/images/141228/dwa93tst.jpg

    http://fs1.directupload.net/images/141228/ga93jeck.jpg

    http://fs2.directupload.net/images/141228/3xp9lf4h.jpg

    Aluminium rods

    http://fs2.directupload.net/images/141228/ysqofwe4.jpg

    http://fs2.directupload.net/images/141228/vnyqfbkv.jpg

    Short test...

    http://fs2.directupload.net/images/141228/s5w3ok5s.jpg

    Okay so I hope you can understand me...I have used aluminium for the rods because the original ones were to hard to cut a 3mm thread in. With my lathe I made the brass jacks. The jacks have an outside diameter of 5mm and a 2.6mm drilling. The connector has an outside diameter of 2.5mm.

    So you need 8 brass jacks for one Chrony. Four in the lighting system and four in the black "plastic thing". I also have build in a bridge rectifier in the lighting system, so it does not matter how you put them on the rods (polarity protection).

    On the next picture you can see the battery in a non-flammable bag.

    http://fs1.directupload.net/images/141228/c74sonyx.jpg

    And yeah it does not only look tight - it's really tight :)

    Here you can see the Duo-Led (Green, Orange, and Red)

    http://fs2.directupload.net/images/141228/29sl83p2.jpg

    Green

    Orange after 6h Runtime

    Red after 10h Runtime

    http://fs2.directupload.net/images/141228/cwvc5w3e.jpg

    http://fs1.directupload.net/images/141228/tga88oeh.jpg

    The main circuit with undervoltage protection, 2 Step-Down Convertor 9V and 5V, one Step-Up Converter for the lighting system 25,4V, the circuit for the duo-led...

    http://fs1.directupload.net/images/141228/calwtwe9.jpg

    If there are any questions feel free to ask me. The Chrony works perfect :) Runtime is 13,5h. Bluetooth Connection also works perfect but the greatest distance was 40m over this distance the connection isn't fast enough and it doens't work well.

    Greetings from Germany

    Johannes

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