Power a 5V relay from GPIO pins GPIO pin voltage is too low to energize relay Properly wiring a solid-state relay to the GPIO pins? How to add isolation between raspberry pi and relay board? How to control the 5v output from raspberry pi to open and close a relay Powering a 3-12V water pump on raspberry pi Connecting relays to a Raspberry Pi via radio Is this behaviour of GPIO pins normal? Driving 12V relays from Raspberry Pi gpio pins stop working after connecting to a relay What things I can use for turning on a relay? Using a relay to bypass a button Is a 500 watt floodlight compatable with Raspberry Pi Relay Board v1.0? Even setting a pin to output activates the relay Home Automation, Mechanical Relays and Physical Switches Can I use GPIO to close a circuit on a RC sender PCB? GPIO switch relay 12V AC Power over USB vs from Raspbery Is it bad for the PowerSwitch Tail 2 to turn on and off frequently?
Web relay switching keyboard shortcut [closed] Control physical switch with raspberry pi and read the state of the switch Is it normal when a pin goes low it triggers a interrupt on an another one? How can I replace “Wireless Remote Control Switch” with Raspberry Pi? Signal generators are a handy thing to have around the lab. They are perfect for testing inputs on a new hardware design and verifying the behavior of a circuit before connecting all the pieces together. In recent years these lab tools have not only decreased in size but also in cost. The result has been a plethora of portable versions that now exist on the market. For an engineer-on-the-go, this is very convenient but often times having to bring one more piece of equipment always seems to put the tool bag over the 50 pound limit. This is one reason why it is becoming popular to design lab equipment that can be plugged into a smart phone. Rather than carry around another device with a computer in it, utilizing the computing power and capabilities of the phone allows the device to be smaller, cheaper and weigh less!
So how can someone turn their smart phone into a signal generator? The simplest way is to exploit the headphone jack that is already present on the phone! There is no need to get fancy and try to interface to the onboard USB! Now just like any engineering project there are limitations on the requirements of what this port can do. A standard headphone jack will typically only cover the frequency ranges that a human can hear (20 – 20,000 Hz). This seems like a limited range but for most sensors and applications this is actually a pretty wide range. A great example application is for medical sensors such as EKG, EEG and EMG. These signals don’t have components much over 100 Hz at the most! The smart phone signal generator can be built for less than $15! The hardware consists of a single stereo 3.5 mm headphone plug, some wire and then optionally three alligator clips to connect the signal generator to the test device. The headphone jack consists of a right and left channel in addition to a ground.
Figure 1 shows an image of the headphone jack being soldered with three wires. The big metal tab on the bottom is the ground with the green and red wires being attached to the left and right channels respectively. Once the headphone jack is soldered, it can be closed up and the alligator leads can be connected either through solder or the set screw depending on the type of connector chosen. The final piece of hardware can be seen in Figure 2.Soldering the headphone jack There are a number of software options available for both iOS and Android operating systems through their respective application stores. For iOS, Sig Gen seemed to be the best option available on the market and for a cost of less than $3! Figure 3 shows an example of how the application looks on the phone. For Android, there were far more choices than for iOS. The best looking option that was tested was called Waveform and literally was designed to look like the front panel of a signal generator! It can be seen in Figure 4.
Both of these applications provided the ability to change common functions such as the output signal level, the waveform and frequency. Since the hardware is a phone, the applications also include the ability to generate different waveforms on left and right channels of the headphone jack; each of which is independently controlled! It’s like buying one channel and getting a second one for free! Dynamic Closures develops, manufactures and markets innovative side folding and overhead rolling security enclosures, consistently producing esthetically appealing doors that are easy to install, take up less space, and offer more preferred features than competitive products. Learn more about Dynamic Closures LEAN AND GREEN FOR Dynamic Closures is always looking for new ways to reduce, reuse, and recycle throughout the entire operation. We continually work with professional environmental consultants in our operations. Our green approach finds its way into our customers.
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