Hi I would like to know where to buy the servo control card Shield V4 for my Braccio. There are no signs of failure on the components from the card, but something is on short circuit. With the servo control card installed on top of the Arduino UNO and all servos unplugged, when I connect the Arduino to the PC (USB), the power drops immediatly. When I remove the servo shield from the Arduino UNO and power it with the PC (USB), The Arduino starts-up normally and I can run programs on the unit. Powering the Shield V4 with the 7V power supply, it goes immediatly into ERROR, whether on top of the Arduino or separated, connected to the servos, or diconnected. It's clearly a fault on the board, and I'm totally frustrated as I can't find it anywhere. Your assistance is appreciated.

[image] jfmota78: Shield V4 for my Braccio Tinkerkit T050000 Try this: [image] Switch Electronics - Now stocking Arduino Products and Services tada Exciting news for UK Arduino enthusiasts! tada Switch Electronics now stocks a growing range of Arduino boards and accessories! Whether you're a beginner or a pro, we’ve got all the components and tools you need to bring your projects to life. Check out our range and grab yours today: Switch Electronics. Let's get making! robotsparkles Or ask these folks... An EU-based economic operator who ensures the product's compliance with the required regulations. Arduino S.r.l. Via Andrea Appiani, 25 Monza, MB, IT, 20900 Phone: +39 0113157477 Email: support@arduino.cc

Thank you so much. I will try Switch Electronics and will give feedback. Regarding support@arduino.cc, I've tried... The answers look like AI generated... I just want to know where to buy the card, and I'm being sent on a wild-goose chase to fault find and send videos....

[image] jfmota78: where to buy the card, Through searching, it looks to me the shield is not being produced individually, and as you may have seen, unsupported. Keep trying. Something will turn up.

Is there any Shield you can advise me to connect 6 servos? (4x SR431 + 2x SR311)

[image] jfmota78: Powering the Shield V4 with the 7V power supply Use 5VDC power for the shield and 7.5 - 12VDC for the Arduino. [bracciomotorshield] [image] Tinkerkit Braccio shield v4 - documentation Robotics The middle pins of the I0..I5 connectors are connected to the A0..A5 pins of the Arduino, so you can do whatever you can do with Arduino's A0..A5. You may want to refer to this forum topic for using these pins as digital inputs. The other pins of these connectors are ground (Pin1) and +5V (Pin3). The green connector is labeled TWI and should be usable as TWI (a.k.a I²C). The pins are: Ground +5V SDA SCL For the curious: the SDA and SCL pins are not directly connected to Arduino's TWI pins. … I do not have a source for the Braccio Shield. It has input pins (white), servo pins (orange), serial connector (yellow) and I2C connector (green)... as well as power conditioning, communication I.C.s and connections to the Arduino Uno. You could try running without the shield, using Hardware Serial for communications. [image] sixServos - Wokwi ESP32, STM32, Arduino Simulator Run IoT and embedded projects in your browser: ESP32, STM32, Arduino, Pi Pico, and more. No installation required!

Maybe you can use a PCA9865? [image] Adafruit PCA9685 16-Channel Servo Driver Learn how to connect and program the 16-channel 12-bit PWM/Servo Driver with Arduino, Python or CircuitPython https://docs.arduino.cc/libraries/pca9685-16-channel-pwm-driver-module-library/

Thank you for the support. Really appreciated. I've looked at the PCA9685, but I was in doubt about the current capacity of the card to feed the actual motors. But I have been dumb... I've been focused on the Shield V4 card fault and forgot to look at the basic operation of the servos! I can connect the +- of the servos directly to the power supply (so the current won't affect the Arduino board), and use the Arduino's PWM pins for control... The Braccio library won'twork anymore, so it will keep me busy for some time developping a new library! I just have to make a plan for the "Soft Start" function before the arm breaks itself on start up... I will try to work on it over the weekend and will let you know how it goes. Thanks

Do you have "soft start" code or documentation or a description?

If I undertood the Braccio documentation right, the soft start is done on the servo controller board (the faulty one). On the start-up, the voltage to the servos is increased slowly to prevent full torque on the servos when moving to the home position. On the past, with the soft start function disabled, I've broke one of the splines. It can be quite violent on the change of position. Only 2 solutions are coming to my mind.... ensure the arm is always moved to the home position (by hand), before switching on. use a regulated power supply to the servos, to ramp the voltage up on the start... This is one of those toys I've bought for my kids, but it's me who has fun with it!

Tinkerkit Braccio T050000 - servo control Shield V4

Community General Discussion

xfpd December 4, 2024, 4:55pm 7

Use 5VDC power for the shield and 7.5 - 12VDC for the Arduino.

I do not have a source for the Braccio Shield. It has input pins (white), servo pins (orange), serial connector (yellow) and I2C connector (green)... as well as power conditioning, communication I.C.s and connections to the Arduino Uno.

You could try running without the shield, using Hardware Serial for communications.

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Tinkerkit Braccio T050000 - servo control Shield V4

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