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In the Handyboard manual it says when charging in trickle mode you should turn the Handyboard off, however when I do try and turn the Handyboard off the charge light on the serial/charger board goes off? Is the board still being charged or is there (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: evaluate inverse cosine, sine in IC
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(...) The most efficient way to do it is to use Taylor Series approximations of the functions. Decide how much precision you need, and then write functions that evaluate the first few terms in the appropriate series. Usually, a series will converge (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | evaluate inverse cosine, sine in IC
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Hi, is there a way to evaluate inverse cosine and sine using IC? Thx (25 years ago, 15-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Video Transmitters
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(...) I't not that cheap, but if you want small size and low power consumption check out this 900 Mhz transmitter/receiver pair from supercircuits: (2 URLs) here's a very small camera with transmitter built in: (URL) if you want to receive on a (...) (25 years ago, 15-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Video Transmitters from JDR
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[glashan] spake unto the ether: (...) From the fancy TV receiver you describe, I'd say you wouldn't have to do anything but select NTSC mode. The kit is supposed to transmit over the range of VHF channels 3-7, but my specific kit only does 3-5 (why (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Video Transmitters
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NetMarket (www.netmarket.com) carries a transmit/receive pair made by Recoton. It's intended to transmit audio/video around the house. Ours includes a gizmo to extend your remote control capabilities, and it cost about $120. Just the (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | Re: mixing variable types in IC
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[Ben Davis] spake unto the ether: (...) Hmm, I think you want c = ((float)(x))/((float)(y)); Otherwise, the division will be done first as integers, giving an integer quotient, which you're then turning into a float. *Rich* (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | mixing variable types in IC
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Hi John- You can convert quantities from one data type to another (it's called "casting", I believe). The following computes the quantity x/y, then converts it to a float: ---...--- int x, y; float c; float divide ( int x, int y) { c = (float) (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | mixing variable types in IC
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Now that I got past my nested function problem I have discovered that IC does not like mixing variable types. For instance, this results in an error: int x, y; float c; float divide ( int x, int y) { c = (x/y); return c; } IC will not let me (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Video Transmitters
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[glashan] spake unto the ether: (...) JDR Microdevices ((URL) sells a $25 short-range VHF TV transmitter kit. It's all analog, so there is some drift with warmup and it needs a very stable power supply, but otherwise it works great. The observer (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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