Questions tagged [reverse-engineering]

The process of taking a completed system and determining details of its design; may have legal limitations or ramifications in different jurisdictions

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862 views

Reverse-engineering VGA

I got a x86-based firewall, produced by Stonesoft. It has serial interface, but it would be easier to install new operating system if I would get VGA output from the device. I discovered promising ...
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2answers
7k views

Recreating a missing wireless keyboard dongle with NRF24L01

I have found an old Logitech Wireless Keyboard (specifically, the MK250 model), which was originally sold with a separated "standard" 2.4Ghz receiver dongle (Not 'Unifying', as written here). I assume ...
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3answers
792 views

JTAG boundary scan registers

On the internet, it always shows that each pin of the IC has its own Boundary Scan register (the yellow boxes) But looking at BSDL files there are actually more BS registers than pins. So for the ...
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0answers
141 views

USB signal analysis

I have a device that I want to control it has window software that runs it, and a complex interface. I just need a pair of commands, also I know very little about usb device hacking, and signal ...
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2answers
976 views

Help identifying pinout [closed]

I've found a mini camera. The device has a mini-objective with a tag P3.7 (I guess this is the resolution), 2 wires (red and white which I suppose are ...
9
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3answers
11k views

Securing code on an AVR/Arduino and delivering updates

What is the best way to protect code flashed onto any AVR based device from reverse engineering? What is an easy way to provide updates to end users to flash on their own without disclosing the code? ...
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1answer
286 views

Reverse Engineering: TTL/LVTTL signal direction

I just ordered my first scope (a Rigol DS1054Z) and have been thinking about some interesting experiments/learning projects to perform with it. Thus far most of my experience has been in building ...
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2answers
4k views

How do I use a 5 pin potentiometer?

I have a 5 pin trim pot I desoldered from an old board. I am assuming maybe it is a dual gang poteniometer or something with a common ground pin. Does anyone have any ideas what the actual pinouts ...
4
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2answers
462 views

Why does timing change in dataframe using Manchester encoding

I have successfully received a couple data frames from an RF transmitter. I compared couple consecutive frames and the timing deviation between them is marginal, so I am convinced it is reasonably ...
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1answer
273 views

Sourcing An Image Sensor? [closed]

I'm wanting to create a basic digital camera, I have most of it figured out... except for the image sensor itself. Looking in the normal places (digikey, mouser), I'm finding some very basic, low ...
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3answers
1k views

Why does this EPROM have comb-like structures around the wire bonding pads?

I took some pictures of a Microchip EPROM die from the late 80s / early 90s (I can't recall the exact part number). The wire bonding pads are surrounded by a comb-like structure. What is the purpose ...
2
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1answer
236 views

Identifying a component symbol in a schematic [duplicate]

Problem: So I have ran across the following part and I simply don't know what it is. I tried searching for if you will a description of it. (I.E. two diodes on top of each other pointing opposite ...
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4answers
1k views

Wiring up an LCD display with unknown controller

I found an old LCD in my pile of trunk. I would like to be able to use it. However, someone (possibly / probably me) sawed off the part of the PCB with the series code, so I can't know what the ...
0
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1answer
546 views

AC switch & power supply reverse engineering

Below is schematic of self-powered(by passing little current not enough to operate) switch reverse-engineered from PCB. simulate this circuit – Schematic created using CircuitLab Zener diode(...
7
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5answers
2k views

How to start reverse engineering a circuit?

I have an old controller card from a pc which had to control some stepper engines. But there are several problems with it: The pc isn't working anymore, and I have no access to the program which ...
1
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1answer
63 views

Is it advisable to try to discover a place to make a ground connection on a board with a separate AC power supply?

I am building a device consisting of a microcontroller (an Arduino mini) attached to various output devices, which will be triggered using a wireless doorbell receiver. The receiver is a single board ...
3
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0answers
482 views

Help reverse engineering a CRC-8 [closed]

I have an arduino based home temperature monitoring system using Ambient Weather F007th wireless Thermo-Hygrometers as sensors. I am trying to work out the CRC and add some code to my project to ...
3
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2answers
2k views

Reverse-engineering RF packets

I have a Blue Line Innovations PowerCost Monitor. It sends packets to a display unit over a 433.92 MHz RF link. There is code (Power Monitor, incomplete) to detect these packets with a RF Link 4800bps ...
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1answer
219 views

STK4192II pinout?

I have been blowing through bandwidth trying to find a pinout diagram of an old STK4192II stereo amp IC but all I can find are reference design schematics, while these will work I guess I want to use ...
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1answer
4k views

Replay Philips Livingcolors remote signal

I have a Phillips Living Colors Lamp, which comes with a remote control. I'd like to be able to capture/replay the signal of the remote control so I can control the lamp with a microcontroller (...
4
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1answer
3k views

Could I connect USB wires to this mysterious device?

In a treasure box, as I call the boxes full of old computer electrical parts, I have found a device marked HannStar MV-4 94v-0 0611 E89382. I'm intentionally linking you to google search so that you ...
0
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3answers
852 views

Reprogram a calculator to a cash register

due to the "high cost" (at least from my point of view) of a thermal printer I was wondering whether it was possible/worth the effort to buy a compared cheaper device with it integrated already (a ...
7
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2answers
18k views

Reverse engineer: How do I remove the black plastic that hides the ics?

I am hacking a circuit and it has this black plastic thing (see picture below) that hides part of the circuit. How can I remove them to see what is inside? What they are for? I think they are for ...
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0answers
151 views

Any Home Made Alternatives to using X-rays to identify ICs?

I am on the hunt for several ICs by searching for the markings on them. But sometimes the markings are just too vague and I cannot really guarantee that the IC I found is the IC I am looking for. I ...
2
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3answers
195 views

Sniffing a proprietary data line at 47.5V

I need to sniff the physical layer of a proprietary data line with a logic analyser, but my analyser is limited to 5V input. Unfortunately the line runs at 47.5V, which would fry everything. I ...
0
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1answer
84 views

Measure/Access Information from small device through audio jack (mic)? [closed]

I've got a small device that I have not yet opened. It sends some unknown sequence of voltage and current through a medium for a few seconds thereby calulating and then displaying a result value on a ...
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1answer
187 views

Identifying this “Transistor”, in this particular circuit [closed]

I'm in FIRST robotics, and I've been helping with our robot over the past few weeks. Every robot (in FIRST) is required to have a status light, which is fancy-ily connected to some other gear. ...
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2answers
134 views

Need help with finding the electronic schematics

I'm trying to find what kind of circuitry(circuit components or schematics) is used in this anemometer: http://www.nrgsystems.com/sitecore/content/Products/5966.aspx There are a lot of details about ...
2
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1answer
80 views

Coolpix L27 trigger mechanism

I plan to do a 3d scanner with low-grade digital camera. I opened a coolpix L27 and found this : Does anybody knows how this kind of button is called (may be it is normalised and finding a datasheet ...
4
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1answer
398 views

Why are some AVRs marked with 'atmega' and some marked with 'mega'?

I'm working on hacking the MCU in my MLP4DSM radio for an RC helicopter. The model number on the MCU is scratched out, but I can clearly read MEGA without an ...
3
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1answer
1k views

How can I tell which alternative is used in PoE?

I need to disable the power over ethernet being output by a device to prevent any damage to routers and switches. After looking more into how PoE works, there appears to be two alternatives to how the ...
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1answer
540 views

DE-9 monitoring solutions?

My treadmill connects to its controls via a DE-9 port interface and I'd like to reverse engineer it so I can control and monitor it via my computer instead. I would hope it perhaps uses RS232, but ...
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7answers
14k views

Reverse engineering USB signals

Let's say there is a USB stick that is specifically for storing dates or days or some kind of arbitrary data. In order to access the data you must have the software. Is there any way to analyze the ...
2
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1answer
340 views

Analyzing 4-pin data port to determine protocol

I have a Solar controller for my pool, it controls the pump and actuator for routing water onto the roof to heat it up, when required. The controller knows the pool and roof temperatures, as well as ...
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0answers
3k views

How to calibrate a Kill A Watt meter and understand its hidden service menu [closed]

I found a hidden menu within the Kill A Watt P4400 meter, which is accessed by holding down the Volt and Hz buttons. Although I rendered my meter unable to measure accurately because of my futzing ...
1
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1answer
453 views

Nano Electric Receiver Switch - Circuit Components

I want to recreate the circuit board below, but I am having a hard time figuring out what components I need. I have been trying to look them up on mouser but I haven't got any results. It is called ...
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1answer
224 views

Can I use a Bus Pirate to drive this VFD?

So a few months ago I asked the question on how to analyze a display. Since then I have found out much information about this board. From some trace following it seems that Brown - DATA Red - ...
13
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3answers
1k views

Is it possible to reverse engineer an analogue IC from a physical example?

Lately I've been investigating custom ICs developed by Roland in the late 70s/Early 80s for their analogue synthesizers. They stopped manufacturing these components around 1989, there are no ...
3
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3answers
3k views

Reverse engeneering a home automation RF 315Mhz transimtter

I have this remote control and transmitter and I want to reverse engineer the 2 RF signals sent by the transmitter. This is the board. The board says "ak-rk01se". I can also open up the transmitter ...
0
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3answers
1k views

How to profile the communication protocol of my Microsoft Arc wireless keyboard?

I bought a new keyboard for windows, datasheet, and I would like to sniff the packets between the keyboard and the pc / USB transmitter. The datasheet is useless and there is nothing informative for ...
14
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6answers
831 views

Legality of Reverse Engineering

If there was a "law/legal" stack exchange site I'd post it there, but it's in its infant stages in Area 51. I'm a musician and an electrical engineering student. I've designed a modification to the ...
4
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2answers
4k views

Reverse-engineering a brushless ESC, could someone help me understand the circuit

So I'm in the process of trying to reverse-engineer a hobby brushless ESC. Above is the schematic for a single half-bridge drive circuit. VIN is 11.1V D1 is an unidentified diode; all that I've ...
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1answer
2k views

Sending IR signals to Robosapien using Arduino

I am trying to send commands to a Robosapien (first generation) using an IR LED hooked up to an Arduino. I have seen web pages on attaching a microcontroller directly to the toy, but what I want to do ...
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1answer
7k views

How does SOLOSHOT work? [closed]

Does anyone know how SOLOSHOT works? I'm interested in exploring cheap ways of tracking an object relative to another object. So my brother sent me a link to this product and I'm having trouble ...
6
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2answers
325 views

Is there any possibility of dissecting a microchip to get data from its internal memory?

There are many devices that perform various cryptographic operations inside their microchips. One of their key feature is that the secret keys are stored inside of the hardware and never leave it. ...
6
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2answers
3k views

Reverse engineering a 12 pin LCD?

I just found a broken "laser projecting alarm clock". I took it apart, and am interested in only the laser projection arm. This consists of a laser diode (although I suspect that this is actually just ...
3
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2answers
343 views

What is this resistor strip on my helicopter circuit?

RM: Smaller photo substituted - larger slower loading one here if desired: http://i.stack.imgur.com/RPM8l.jpg I am building a helicopter and would like to use a linear servo like the one on the ...
5
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4answers
346 views

Patented hardware architectures

I have seen patented hardware designs at the level of generic digital block such as shift registers, flip-flops and adders. If a chip maker were to include such a design deep within an ASIC, how can ...
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2answers
635 views

Sniffing data from C8051F007

For fun I have taken it upon myself to try to reverse engineer a consumer blood pressure device. The device uses a C8051F007 32 pin MCU. I am trying to figure out how I can eavesdrop on the ...
7
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5answers
1k views

Reverse engineer a chip or go with a new one and start from scratch?

I'm working on an existing toy product and the chip has been discontinued. We still want to produce more of this product. You press a combination of buttons and it talks to you. What would be a more ...