When configured as an input there is a more subtle problem. If the input has its pullup enabled it could affect the circuitry that is expecting to see an A/D input. But if the pullupis not enabled, then when its A/D input is not selected it will be a digital input that is either left floating or it will be driven by a signal that could be somewhere between 0` and 1`.
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Neither is a good idea. (I chose to not enable pull-ups. ) As I mentioned, since 1993 all TVs having a screen size of at least 13" manufactured for sale in the U. S. have been required to have a Closed Caption Decoder. TVs with smaller screens are not required to have the decoder (and I have not seen a small-screen TV that had one. ) The standards for Closed Captioning can be found in 47CFR15. 119 which can be downloaded by going to: and scrolling down to 15. 119 where you can download it in text or PDF formats. The technical standards for Closed Captioning are in 47CFR73. 682 (a) (22) which can be downloaded by going to and scrolling down to 73. 682 where you can download it in text or PDF formats. (22)(i) Line 21, in each field, may be used for the transmission of a program-related data signal which, when decoded, provides a visual depiction of information simultaneously being presented on the aural channel (captions). Line 21, field 2 may be used for transmission of a program-related data signal which, when decoded, identifies a rating level associated with the current program. Such data signals shall conform to the format described in figure 17 of Sec. 73. 699 of this chapter, and may be transmitted during all periods of regular operation. On a space available basis, line 21 field 2 may also be used for text-mode data and extended data service information. The part that is relevant to us is where it mentions figure 17...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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