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Hardware / Re: Level Shifter con Aduino D...
Last post by Adrian_E - Today at 04:20 am
surbyte, usas los BSS138?
Arduino is a development platform intended to allow those interested to learn the workings of a MCU at the hardware level. Any discussion of a HAL such as Python is a non-sequitur and belongs elsewhere.

"Python is definitly (sic) better choice than c languages"
For you this may be true. This is your opinion and while an opinion is always valid, that does not make it right.
Hi, I am working on an independent study for Arduino project in my school, and I'm struggling to find a correct way to power my project. Basically, it is a vehicle with four high torque motors.

I have to power four motors and four servos right now.
Here are the condensed specs for each of the parts.

170rpm Econ Gear DC Motor
Nominal Voltage: 12V
Current(No Load): 0.10A
Current(Stall): 3.8A

HS-785HB Servo
Nominal Voltage: 6V
Current Drain(No load) = 285mA
Current Drain(Idle) = 8.7mA

I will be using two MDD10A motor drivers which can use up to 10A per motor, with 10~35V.

So here's the part I'm struggling with.
Because I don't have a good electronics knowledge, I'm getting confused how to draw a circuit and arranging which to go parallel and which to go serial.

What I've thought of right now is powering with 12V 13A battery, give 6A each to motor drivers through parallel circuit(3A each to motor) and then use the 6V regulator to drop the voltage down and supplying it to four parallel connected servos.

I'm sorry that I have to explain all of this through words, not a circuit diagram.
I wanted to make sure if the idea I have right now is correct.

For that much power, sealed acid battery(Car battery) is the only one I could think of. But because I need everything to be light enough for motors to handle, I was wondering if there could be better ways to arrange the circuit and find a better motor.

Thank you!
General Electronics / Re: currrent limiting
Last post by tim77777 - Today at 04:16 am
Horrendous or not, would it work?

I don't know what foldback limiting is.

PSU design. It just a AMS1117 with 9 volts in, 5 volts out. Bypass caps on both sides.
Added the suggestions to the code: volatile and noInterrupts(); & interrupt(); around the read & reset of the variable used inside the ISR.  No change, BUT, I decided remove the mask/filter code to allow the 2 standard CAN messages that arrive ~twice per second when the car is ON. The interrupt function works fine (forever) until I enter a PID on the Serial Monitor.  The system responds to the first sent message with the requested information message, but immediately after that all interrupts stop coming, even for the unsolicited messages.  So it seems the sending of a CAN message kills the interrupt process somehow.
Networking, Protocols, and Devices / Re: Need Help :(
Last post by uwabara - Today at 04:11 am
I don't know what a "barangay" is and it is not in my dictionary.

20 metres should be possible, but the only way to be sure is by testing.

You can't power a 5v Arduino using 2 x AA cells. However if you use a 3.3v Arduino or if (as I do) you build an 8MHz Atmega 328 on a piece of stripboard then you could power everything from 2 x AA cells. The advantage of using the Atmega 328 is that it has no energy-wasting attachments.

barangay = residential community. if ever i will pursue with using arduino, what source can you recommend? and also, for the atmega, will i be only using this as my mc and where would i code this?
General Electronics / Re: currrent limiting
Last post by allanhurst - Today at 04:10 am
That's horrendous.

Can't you modify the supply side to be foldback limiting as I suggested? I'll hack out a circuit if you'll give me your psu specs/design.


That devices's 50A 'continuous' rating is for a pulse < 300uS long, 2% duty cycle.

Not on for 10 seconds.....

Magic smoke in your application!

Try eBay etc for suitable starter solenoids.

I'm looking for an ODB2 device that's small, fits in the ODB2 port on the car, and is self contained.  I've seen these, but the software support for them have been lacking decent support and features, so I think the market is prime for an OSS solution.

Option A
Interfaces: ODB2, GPRS cellular data, GSM SIM slot, GPS

Option B
Interfaces: ODB2, 3G/4G/LTE cellular data, GSM SIM slot, GPS, WiFi HUB

Option C
Interfaces: Option B + jacks for audio in/out

Option D
Interfaces: Option C + video in

Option E
Interfaces: Option D + relay (kill switch)

Project Guidance / Re: BLE Gateway
Last post by czu001 - Today at 04:05 am
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