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Questions tagged [hacking]

Questions about retrofitting or modifying an electrical component or device to achieve new functionality/feature or eliminate an undesired one.

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42 views

Hacking an eight cell battery monitor

My goal is to monitor each cell voltage of a seven cell li-ion battery and send this to a Linux board, specifically the Jetson TX2, over i2c. There does not seem to be any off the shelf component that ...
1
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1answer
73 views

Arduino serial communication hacking

I recently bought a Chines massaging chair hoping i can intercept the serial communication between its wired remote and the chair itself, I've cut the wire and connect the Rxd and Txd of the chair to ...
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2answers
62 views

Simulate Arduino keypad with Arduino

I came up with idea to create a simple keypad lock using this ( Keypad Matrix 3x4 https://grobotronics.com/keypad-12-button.html?sl=en https://learning.grobotronics.com/el/2013/07/using-a-3x4-keypad/ ...
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3answers
63 views

Building a device to reduce pulse frequency by a variable amount

A speed sensor on the wheel of a mini motorcycle sends pulses as the wheel rotates. It may send 1, 2 or 4 pulses per tire revolution, so let's say that at top speed, it may have 10, 20 or as many as ...
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2answers
75 views

Bidirectional (opto?) isolators for any protocol?

I would like to isolate digital serial communication between 2 circuits. I don't know much about the protocol between two circuits. It is not a common protocol such as SPI or I2C. Shortest pulses are ...
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0answers
37 views

Compact way to fake a 24VAC relay?

I am integrating a Nest Thermostat with an open automation software, and need to make it think its W, Y and G wires are connected to something -- normally a 24VAC relay driving 120V appliances. How ...
1
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1answer
104 views

Bypassing DSLR battery to power camera from power supply cheaply with bidirectional optocouplers

I am trying to power my Nikon DSLR with a permanent power source instead of the battery for long captures (overnight) without buying the overpriced battery adapter. I can't simply connect a AC-DC ...
0
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2answers
293 views

Change a quartz clock timebase by changing the frequency of the quartz crystal oscillator?

I've been doing some research on rewiring clock circuits for a project, but I'm new to these types of pulse-counting circuits. My question at this point is: If I replace the existing quartz crystal ...
2
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1answer
2k views

How can I reuse a crowdled bracelet?

I have been to an event last night, where I some wristbands produced by the Crowdled company (see links at the end). Material of one band: 3 colored leds (2 in total) and a button. Runs on battery. ...
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0answers
287 views

Is this a temp sensor on my battery pack?

I am trying to modify a battery pack for a Ridgid nailgun to use replaceable 18650 Li-ion batteries. The original pack looks like this: I've printed an adapter which holds 5 cells and wires to the ...
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3answers
188 views

Which microcontroller and transistors can I use to control these switches?

I have a SATA HDD case (product details) with switches that toggle the power supply for each HDD. My aim is to control each switch individually via software. (My background: I'm a total novice to ...
4
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1answer
134 views

How a modchip overrides specific signals?

I read an article on the original PSX copy-protection scheme lately, and how the modchips of that era were implemented using PIC MCUs. Then this question popped up, and I haven't been able to find a ...
7
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2answers
1k views

STM32L MCU - SWD pin on board not matching processor pinout

I was doing my hardware hack project on an air quality monitoring device which uses STM32L476 processor. My only experiences with hardware hacking are IPcams or ...
0
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2answers
51 views

Guess the conector DVL Edition?

Here is a challenge we have a connector on a certin dvl(Doppeler Velocity Logger) and we cant get data from it. So we got a pinout,but without knowing pin 1 on the connector or what type of connector ...
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0answers
69 views

What kind of connection is this?

I am trying to control my ventilator with a relay. I have found schematics of how to install it. Basically, I would like to immitate a wall switch with a relay to start the ventilator. The board of ...
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2answers
214 views

Creative T3100 speakers input mod

I have made an input mod to increase the input impedance of my Creative T3100 speakers. But now even if the potentiometer is at the lowest level some sound from the input is coming off from the ...
0
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0answers
46 views

Locating ground and other pins on circuit board

I am a beginner attempting to learn how to hack RC cars like is demonstrated in this video. My problem is I can't spot the ground pin and the other pins related to the wheel drive functions except I ...
0
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1answer
186 views

5v/1A input instead of 3.6V/900mA input

I have a baby monitor that accepts a 3.6v 900mA battery and is charged via USB mini. The USB port broke off and so I was unable to charge or power the device. The USB pins were too small to solder ...
3
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1answer
263 views

Troubleshooting 4066 as a button hack

I have an Arduino project which needs to simulate a human button press on a third-party board, an 883LM garage door opener controller. The other board has its own power supply which is separate from ...
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2answers
47 views

GSM Relay which of these pins is which? [closed]

When the relay (the blue deely) is activated, an LED should light up. A one contact from the battery and the correct contact from the LED must be connected to each other. What should the remaining ...
4
votes
2answers
228 views

hack color changing candle circuit

I'd like to modify a color changing candle (example) circuit so it can be turned on without lighting the actual candle. It uses a photodiode and a optical fiber alongside the wick to cycle the RGB ...
1
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1answer
55 views

CC110L strange clock signal

I'm trying to hack my wireless thermostat to control my heating. I disassembled my unit and found the communication chip ( CC110L - SPI 433MHz). I searched for the datasheet and tried to determine ...
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1answer
40 views

replacing pots on bench psu

I have this bench psu. (datasheet, manual). It has worked wonderfully so far, but my one problem is that the current adjustment knobs are only 1 turn, while the voltage knobs are 10 turn. I want to ...
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4answers
105 views

Tapping SPI communication with 328U

I'm trying to extract data from a 4x14 segment alphanumeric display controlled via 2*595 in series and 4 transistors. Serial data is fed from STM32f103, its firmware should not be changed. Problem is ...
5
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1answer
4k views

Hacking a cheap DC-DC buck converter module (LM2596 chip) into a CC LED driver

On the Internet you can find plenty of dirty cheap DC-DC buck converter modules like the following: which is based on an LM2596-ADJ SMPS IC and follows the schematic in the application notes of the ...
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1answer
1k views

How can I make this five-wire, 12V motor work?

I've been working on a project on my free time that requires a motor. I've been using a 6v motor (which has a positive and a negative wire). However, I found a mechanism in this bidet that I thought ...
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1answer
411 views

Hacking DSLR battery to power camera from power supply [closed]

I would like to power my DSLR for long captures with a power supply. I know the voltage and inner structure of the official batteries. The battery has 2x 3,7V cells inside with a circuit. People ...
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1answer
100 views

Make DVD legible in CD drive? [closed]

Don't laugh just yet. I'm well aware that it's impossible to normally read a DVD because the data tracks several times smaller. However, would it be possible to write double/triple tracks so that the ...
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2answers
269 views

Using HDD as an input device for Arduino

I'm wondering if is it possible to use an old HDD as an input device that would feed some kind of data to Arduino. If you manually positioned the head and platter (the disk is not spinning, so it ...
3
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3answers
506 views

RTC chip not happy with xtal waveform

Update: This question is based on a wrong assumption, the problem has now been fixed. The problem was an incorrect register setting in the RTC. However the answers given regarding load capacitance ...
0
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1answer
89 views

Replacing a PC-mounted SMD microcontroller with headers

I purchased a PC board with lots of interesting I/O that's being controlled by a single microcontroller in a 44-pin QFP package. I'd like to access the I/O lines directly so I could hack in my own ...
0
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3answers
170 views

How to a build a payphone controlled iPhone? [closed]

I'm trying to create a project for my kitchen that involves using the shell of an old payphone and a modern cell phone ( perhaps iPhone ) to actually make calls. Basically, I would like the user to be ...
0
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1answer
358 views

How does this push button work?

I'm on a quest for wireless coffee. I've succesfully hacked my nespresso with a nodemcu, that will now let me wirelessly make a coffee. that is - when the machine is already on - so I need to figure ...
2
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1answer
125 views

Adjusting the gain in Pre-Built Circuit

I have bought a phono-preamp stage from Audio Technica, and the output is quite low. (Using a MM cartridge.) I managed to retrieve a data-sheet which shows how the circuit is laid out. I'm not ...
1
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1answer
152 views

Is 'hot-wiring' two contacts a proper way to bypass a broken button?

I have a broken cell phone, and its power button is not working at all. Examining the device's motherboard I have discovered the button has five pins. As seen on the manufacturer's service manual, ...
7
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4answers
2k views

Can I (ab)use a transistor as an ESD protection diode?

The MIDI specification suggests a fast switching diode to protect the optocoupler's LED against ESD that could exceed its reverse voltage: But this is the only diode used; I could simplify the BOM if ...
0
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3answers
122 views

Hacking characters in custom LCDs [closed]

Say I have a device/instrument that has custom LCD for display with mix of text and graphic/icon on the corners. I want to log the values and feed it to the computer or say automate a response when ...
5
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2answers
2k views

How to power a scanner light with adapter, not battery?

Sorry for the noobish question. I'm a computer scientist, so my electrical engineering knowledge is of the "don't put fingers in electrical outlet" level. I'd like to know how to power a salvaged ...
0
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2answers
214 views

Micro controller to set 'dial knob' mode on multimeter [closed]

Can a microcontoller be used to replace the "dial knob" function in a 'off the shelf' multimeter(10A max AC/DC). Is it easy to scale and micro control multiple identical multimeters using one ...
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1answer
666 views

Hacking a dollar store alarm [closed]

Hi guys I saw these window/door alarms https://m.dollartree.com/h5/r/product/Battery-Powered-Window-Alerts/p328789/index.pro at the dollar tree that work off of inductance I'm guessing. When the ...
1
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2answers
270 views

Safe push button hacking

Here is an object push button that needs to be hacked: simulate this circuit – Schematic created using CircuitLab Hacked object circuit is not accessible. From multimeter : button is ...
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1answer
367 views

Detecting open circuit, very low power

We need low power consumption (1nA - 1uA) while the circuit is closed, and then wake the microcontroller when the circuit is opened. A the moment the design includes a custom metal switch which will ...
2
votes
3answers
5k views

Safety when using ATX power supply as benchtop supply

I found many pages where people convert an ATX power supply to a benchtop power supply to give 12, 5, 3.3V. However the current output can be very high (several amps). When using this and you NEED ...
1
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1answer
1k views

Hook up bluetooth antenna to an Arduino (Or similar)

I have a Bluetooth ELM327 adapter that I am using with my car's OBD2 port. I have an Arduino UNO compatible Magpie (Little Bird Electronics) which I would like to use to interface with this adapter. ...
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2answers
3k views

Auto start and stop water AC motor using these two circuits

Problem: I have a AC motor (pump) which pumps water from the ground floor to 4th floor. On 4th floor, I have water tank. The problem is I have to start the motor in 5AM in morning. I have ...
1
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1answer
604 views

Chinese Adjustable 60W soldering iron problem [closed]

I bought a 60W Adjustable soldering iron from China last year. I think it's designed to run at 220v because it is not hot enough when connected to 120v. It measures about 200 degree C. So I decided to ...
0
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1answer
248 views

How do ALU flags communicate with the rest of the computer?

How are ALU flags connected to various parts of a computer? I've just finished building an 8 bit computer in Logisim that can add subtract and compare... and am wondering how I can make it multiply (...
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2answers
271 views

Piezo contact mic into iMac - avoid signal spikes

I've wired an external piezo as contact mic to the TRRS 3.5 jack of an iMac and it is working fine - BUT the signal will just randomly stop after hitting the contact mic several times too hard, so I ...
4
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2answers
9k views

Disabling DisplayPort hot plug detect

I have a PC with a DisplayPort monitor. When the monitor sleeps or is powered off, the OS loses track of the current display resolution. My research indicates this is probably due to the Hot Plug ...
2
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1answer
2k views

fool device that lipo battery is connected

I want to hack my portable device, so that it does not use lipo battery anymore. I want to have it using just external power supply (don't ask for reasons). Unfortunately after disassembling the ...