New old boards

[Etienne C]

Hello guys, 

Shame on me / I still didn't learn python but you know we can get help now....

However my Galileo/Leonardo and Citirne are now in the picochess board's family :)

Imagine: I can play Galileo Maestro retro engine on picochess on my Galileo board (with Maestro module in it) .... very helpfull isn'it? Citrine is not emulated yet so it is another cattle of fish...so it is kind of small revelation.

Attached work in progress board.py and project recap  for those who want to play around...with no guarantee. It needs a lot of cleaning.

All the best, Etienne

[Etienne C]

 a cleaner recap and latest board.py for OSA

[Johan Sjöblom]

Nice! I might be able to include this in the v4? What version did you use as a starting point?

-- Johan

[Etienne Chaffanjon]

Hi Johan, from v4 but I would not recommend to include at this stage: this needs to be tested further and ideally refactored and improved by our eboard Master….GK.

All the best, Etienne

Le 6 juin 2026 à 18:27, Johan Sjöblom <messi...@gmail.com> a écrit :

Nice! I might be able to include this in the v4? What version did you use as a starting point?

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[Etienne Chaffanjon]

Le 6 juin 2026 à 18:33, Etienne Chaffanjon <picoc...@gmail.com> a écrit :



[waldomiro dias machado junior]

Hi Etienne, 

Connecting the Renaissance to PicoChess should be easy, because I have an excellent OSA cable on one end and USB on the other, made by my friend Gerardo Berger! 

My question is, what cable or interface do you use to connect the Citrine to PicoChess? 

Waldomiro.

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[Etienne Chaffanjon]



Hi Waldomiro,

An homemade BT device based on HC-06 but Berger’s DIN-5 to USB should be perfect. I have made another version of the driver board.py to address the led issue with OSA when there is a take: the destination square leds don’t blink. The idea is to flash the start square 1s then flash the destination square until move made on the board (but waiting for Claude re-arm to debug the take back leds that don’t work anymore for user take backs). Will share when done. 

With a renaissance you will have something closer to the size of a revelation (versus Citrine)!!!…but no piece recognition/position settings.

All the best,

Etienne

Le 7 juin 2026 à 17:51, waldomiro dias machado junior <pet...@gmail.com> a écrit :



Hi Etienne, 

Connecting the Renaissance to PicoChess should be easy, because I have an excellent OSA cable on one end and USB on the other, made by my friend Gerardo Berger! 

My question is, what cable or interface do you use to connect the Citrine to PicoChess? 

Waldomiro.
Em sábado, 6 de junho de 2026, Etienne Chaffanjon <picoc...@gmail.com> escreveu:

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[Etienne Chaffanjon]

Oups I didn’t answer your question. My citrine has a BT module inside again based on HC-06 but you can use a Sabrent USB to serial (plus Citrine adapter ro RJ11) or something similar with Prolific

Le 7 juin 2026 à 17:51, waldomiro dias machado junior <pet...@gmail.com> a écrit :



Hi Etienne, 

Connecting the Renaissance to PicoChess should be easy, because I have an excellent OSA cable on one end and USB on the other, made by my friend Gerardo Berger! 

My question is, what cable or interface do you use to connect the Citrine to PicoChess? 

Waldomiro.
Em sábado, 6 de junho de 2026, Etienne Chaffanjon <picoc...@gmail.com> escreveu:

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[waldomiro dias machado junior]

Hi Étienne, 

Thank you so much for your explanations, I loved them! 

If I understand correctly, you have a Citrine and a Galileo with Bluetooth, is that right? 

Since it's possible to put batteries in the Galileo, you have an e-board similar to the Chessnut that has an internal battery and Bluetooth but doesn't recognize the chess pieces? I

s that correct or am I talking nonsense? 

Waldomiro

Em domingo, 7 de junho de 2026, Etienne Chaffanjon <picoc...@gmail.com> escreveu:

Ops, não respondi à sua pergunta. Meu Citrine tem um módulo Bluetooth interno baseado no HC-06, mas você pode usar um conversor USB para serial da Sabrent (mais um adaptador Citrine para RJ11) ou algo similar com o Prolific.

Le 7 juin 2026 à 17:51, waldomiro dias machado junior <pet...@gmail.com> a écrit :


Olá Etienne, 

Conectar o Renaissance ao PicoChess deve ser fácil, pois tenho um excelente cabo OSA em uma ponta e USB na outra, feito pelo meu amigo Gerardo Berger! 

Minha pergunta é: qual cabo ou interface você usa para conectar o Citrine ao PicoChess? 

Waldomiro.
Em sábado, 6 de junho de 2026, Etienne Chaffanjon <picoc...@gmail.com> escreveu:

Em 6 de junho de 2026 às 18h33, Etienne Chaffanjon < picoc...@gmail.com > escreveu:



Olá Johan, da versão 4, mas eu não recomendaria incluir nesta fase: isso precisa ser testado mais a fundo e, idealmente, refatorado e aprimorado pelo nosso Master da eboard…GK.

Tudo de bom, Etienne

Em 6 de junho de 2026, às 18h27, Johan Sjöblom < messi...@gmail.com > escreveu:

Que legal! Talvez eu consiga incluir isso na versão 4? Qual versão você usou como ponto de partida?

-- John

No sábado, 6 de junho de 2026, às 18:05:48 UTC+3, picoc...@gmail.com escreveu:

 Um resumo mais claro e o arquivo board.py mais recente para OSA.

No sábado, 6 de junho de 2026, às 16:44:46 UTC+2, Etienne C escreveu:

Olá, pessoal, 

Que vergonha! / Eu ainda não aprendi Python, mas você sabe que agora podemos conseguir ajuda...

No entanto, meus tabuleiros Galileo/Leonardo e Citirne agora fazem parte da família do tabuleiro picochess :)

Imagine: posso jogar Galileo Maestro, um motor retrô, no Picochess, no meu tabuleiro Galileo (com o módulo Maestro instalado)... muito útil, não é? O Citrine ainda não é emulado, então é outra história... é uma pequena revelação.

Segue em anexo o arquivo board.py em desenvolvimento e um resumo do projeto para quem quiser experimentar... sem garantia de funcionamento. Precisa de muita limpeza.

Tudo de bom, Etienne

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[Etienne Chaffanjon]

Yes you are right. Also there is an easy way to add a 9v battery in Citrine (see Schach computer) and even better we can put a pack of 18650 inside to avoid cutting the back plate and step back if wanted.

All the best,

Etienne

Le 7 juin 2026 à 22:09, waldomiro dias machado junior <pet...@gmail.com> a écrit :

Hi Étienne, 

Thank you so much for your explanations, I loved them! 

If I understand correctly, you have a Citrine and a Galileo with Bluetooth, is that right? 

Since it's possible to put batteries in the Galileo, you have an e-board similar to the Chessnut that has an internal battery and Bluetooth but doesn't recognize the chess pieces? I

s that correct or am I talking nonsense? 

Waldomiro

Em domingo, 7 de junho de 2026, Etienne Chaffanjon <picoc...@gmail.com> escreveu:

Ops, não respondi à sua pergunta. Meu Citrine tem um módulo Bluetooth interno baseado no HC-06, mas você pode usar um conversor USB para serial da Sabrent (mais um adaptador Citrine para RJ11) ou algo similar com o Prolific.

<image0.jpeg>

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[waldomiro dias machado junior]

Hi Étienne, 

Yesterday I went to the website to research how to put a battery in the Citrine, I'm going to try to do that on mine. 

You commented here that it's also possible to do it with two 18650 batteries, if you have photos and the schematic and could post them here, I would be very grateful. 

If you also have photos and the schematic of how to make the Bluetooth for the Renaissance and the Citrine, that would be wonderful, if you don't have them or can't, no problem. 

I'm a regular user, unfortunately I don't know how to program anything and I don't have the skills you guys have. 

Honestly, I'm a fan of all of you and I read everything you post about the changes and corrections to PicoChess! 

Having a Citrine and especially a Renaissance similar to the Chessnut is a dream! 

Again, thank you very much for your explanations!

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[Etienne Chaffanjon]



Hi Waldomiro, can we share some information outside picochess group as I fear it is out of the scope of the group? Unless advised differently, Randy?

All the best,

Etienne 

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[waldomiro dias machado junior]

Hi Étienne, 

Perfect, let's wait for Randy's guidance on this matter. 

If he thinks it's best, I'll pass my email address on to you; I'm very interested. 

Waldomiro

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[Randy Reade]

Feel free to discuss here if you believe others can benefit from the discussion. Or you can take it private (you can use the 'Reply to Author' option in Google Groups by selecting the 3 vertical dots at the right of the message).

Randy

[Etienne Chaffanjon]

Well noted thanks Randy. I already sent the below in private

I will share the 2 latest board.py for OSA next sunday. 

Hi Waldomiro,

I can try to tell briefly what I did. However when it comes to repair or improve I would highly recommend to reach Berger.

Foy my 1st citrine I used a bolutek circuit board which was very convenient plus the 9v battery as per Computer Schach 

For my 2nd citrine. I didn't manage to make it work with another bolutek board so I went with a HC-06 with RS232 to TTL conversion. I used two 18650 that fits on the edge of the inside with a BMS : more autonomy and charge capacity and no harm to the back plate. This citrine is with my son so I and don’t have picture of the battery pack

For the OSA dongle, it is easier: a DIY plastic case, a DIN-5 plug and a HC-06 plus 2 resistance to divide the voltage to the RX port of the HC-06. It has to be set up at 9600 bauds before and the board as well (see manual).

All the best,

Etienne

Le 8 juin 2026 à 19:44, Randy Reade <randy...@gmail.com> a écrit :



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[waldomiro dias machado junior]

Thank you very much Randy and Étienne! 

I'll be eagerly waiting on Sunday to see what you've done on your OSA project, which you said is easier, then I'll try to do it on Citrine. 

Geraldo Berger has already made several special cables and interfaces for some of my chess machines; he's an exceptional person! 

This time I'll try to do it myself, since I live in another country, Brazil.

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[waldomiro dias machado junior]

Hello Étienne, 

I searched on Google and it says that the standard baud rate of the HC-05 is 9600 Baud. 

If this information is correct, I won't need to program that rate. 

I also saw in the Renaissance manual that it's very easy to change the baud rate to 9600 Baud! 

Please, what are the two resistor values ​​I should use?

Thank you, 

Waldomiro

[Etienne Chaffanjon]





Hello Waldomiro,

I used HC-06 as we only need slave mode.

Default setting is 9600bds you are right (set up would enable to change name and pin but you can skip for OSA).

Din 5 pins can be found here:

Use of resistance to protect HC-06 port 1k and 2k as per:

All the best,

Etienne

Le 10 juin 2026 à 14:05, waldomiro dias machado junior <pet...@gmail.com> a écrit :

Hello Étienne, 

I searched on Google and it says that the standard baud rate of the HC-05 is 9600 Baud. 

If this information is correct, I won't need to program that rate. 

I also saw in the Renaissance manual that it's very easy to change the baud rate to 9600 Baud! 

Please, what are the two resistor values ​​I should use?

Thank you, 

Waldomiro

Em segunda-feira, 8 de junho de 2026, waldomiro dias machado junior <pet...@gmail.com> escreveu:

Thank you very much Randy and Étienne! 

I'll be eagerly waiting on Sunday to see what you've done on your OSA project, which you said is easier, then I'll try to do it on Citrine. 

Geraldo Berger has already made several special cables and interfaces for some of my chess machines; he's an exceptional person! 

This time I'll try to do it myself, since I live in another country, Brazil.

Waldomiro 

Em segunda-feira, 8 de junho de 2026, Etienne Chaffanjon <picoc...@gmail.com> escreveu:

Well noted thanks Randy. I already sent the below in private

I will share the 2 latest board.py for OSA next sunday. 

Hi Waldomiro,

I can try to tell briefly what I did. However when it comes to repair or improve I would highly recommend to reach Berger.

Foy my 1st citrine I used a bolutek circuit board which was very convenient plus the 9v battery as per Computer Schach 

<image0.jpeg>

For my 2nd citrine. I didn't manage to make it work with another bolutek board so I went with a HC-06 with RS232 to TTL conversion. I used two 18650 that fits on the edge of the inside with a BMS : more autonomy and charge capacity and no harm to the back plate. This citrine is with my son so I and don’t have picture of the battery pack

<image1.jpeg>

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[Etienne C]

Hello friends, updated OSA with alternative board.py (board-new.py) to manage leds in a different way (capture flaw)

It certainly needs a lot of improvement: as it is the work of someone whith almost none python knowledge relying on Claude .
All the best, Etienne

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[waldomiro dias machado junior]

Hi Étienne, how are you? I hope you're well. 

Please, when you can, take a picture of the inside of your Bluetooth OSA, showing the wires and the two 1K and 2K resistors so I can make mine, I would be eternally grateful.

No rush. 

Waldomiro

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[Etienne Chaffanjon]

Hi, the picture won’t help you much the resistors were soldered together as per the circuit described in the post and packed in a black tape. The switch is needed because the 5v on the DIN-5 is always on and we don’t want to save the batteries. All the best, Etienne

Le 14 juin 2026 à 20:47, waldomiro dias machado junior <pet...@gmail.com> a écrit :

Hi Étienne, how are you? I hope you're well. 

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