[chbot] HEX and ANSII ATMEGA and Delphi
Marshland Engineering
marshland at marshland.co.nz
Sun Oct 25 23:08:00 GMT 2020
Thanks for the replies. Some useful information.
Basically I'm updating my Dyno hardware/software to include Drum and motor
RPM, 02, Cylinder head and Exhaust Gas temperatures.
All the figures will be +ve between 0 and 65535 and at sample rate of 10 hz.
Not rocket science but working on the Atmega is my equivalent of a Wasjig.
I think I have it all sorted except for itoa which is int and not unsigned
int.
Can I modify my c libraries to make it unsigned or maybe just write my own
function.
Cheers Wallace.
--
Thanking you
Wallace Weideman
Marshland Engineering
704 Marshland Road
Styx
Christchurch
03 3237449
www.marshland.co.nz
On 25/10/2020 at 3:01 p.m., chchrobotics-request at lists.ourshack.com wrote:
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>Today's Topics:
>
> 1. Mantraps, security etc. (Mark Atherton)
> 2. Re: High voltage batteries and electrolytic capacitors
> (Andy Gardner)
> 3. int > ascii > int (Bevin Brett)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Sun, 25 Oct 2020 13:41:43 +1300
>From: Mark Atherton <markaren1 at xtra.co.nz>
>To: chchrobotics at lists.ourshack.com
>Subject: [chbot] Mantraps, security etc.
>Message-ID: <35e4c553-24d2-4370-8761-0fdd037086a4 at xtra.co.nz>
>Content-Type: text/plain; charset=utf-8; format=flowed
>
>I doubt if an electrified razor-wire fence would be considered any form
>of a trap if you had suitable warnings. Take a look at "Holland's Suzuki
>Cars, 4 Shakespeare Road, Waltham". From street-view the electrification
>signs on the fence are visible as yellow rectangles.
>
>If I were interested in tightening up security of a property in an
>enthusiastic manner, I would talk to the police first. Possibly by
>inviting them around to advise.
>
>What was the result of the burglary ?
>
>-mark
>
>
>
>
>On 25/10/2020 11:40 AM, Henri Shustak wrote:
>> Hello,
>>
>> Thank you for the reply. I am wondering would this apply to something like
barbed wire to make getting in/out of a property more difficult? If someone
got injured by trying to get over it?
>>
>> Just had a problem with a drone overhead and then a week later (possibly
unrelated) someone in a group entering the property by climbing the fence.
Hence my questions.
>>
>> Your information has been super useful.
>>
>> Sorry to hijack this thread.
>>
>> Henri
>>
>>> On 25/10/2020, at 11:34 AM, Mark Atherton <markaren1 at xtra.co.nz> wrote:
>>>
>>> 202 Setting traps, etc
>>>
>>> (1) Every one is liable to imprisonment for a term not exceeding 5 years
who, with intent to injure, or with reckless disregard for the safety of
others, sets or places or causes to be set or placed any trap or device that
is likely to injure any person.
>>>
>>> (2) Every one is liable to imprisonment for a term not exceeding 3 years
who, being in occupation or possession of any place where any such trap or
device has been set or placed, knowingly and wilfully permits it to remain
there in such a condition that any person is likely to be injured by it.
>>>
>>> http://www.legislation.govt.nz/act/public/1961/0043/137.0/DLM329707.html
>>>
>>>
>>> On 25/10/2020 11:30 AM, Henri Shustak wrote:
>>>> Hi I am actually looking right now at what these laws are if anyone can
explain in simple terms that would be great. Basically, are you responsible
for trespassing people injuring themselves on your property? Any links would
be welcomed. I have not had any luck finding the details or even an overview.
>>>>> Damn that mantrap law.
>>>>>
>>>>> On 5/10/20 7:37 pm, Mark Atherton wrote:
>>>>>> I was about to express concern about the type of insulator that your
coffee table is constructed from (mica ?), but on second thoughts I might be
better off asking if you charge the unit before going to bed at night. Might
be good at catching burglars :)
>>>
>
>
>
>------------------------------
>
>Message: 2
>Date: Sun, 25 Oct 2020 14:33:35 +1300
>From: Andy Gardner <ceo at andygardner.com>
>To: chchrobotics at lists.ourshack.com
>Subject: Re: [chbot] High voltage batteries and electrolytic
> capacitors
>Message-ID: <9ed093b6-4ba0-20c5-7a5e-b9a876df1b25 at andygardner.com>
>Content-Type: text/plain; charset=utf-8; format=flowed
>
>
>https://ccc.govt.nz/consents-and-licences/resource-consents/residential-and-housing/property
>
>####
>
>Barbed wire or razor wire fences
>
>The Council Public Places Bylaw 2018 states that barbed wire, razor wire or
electrified wire may not be used within one metre of any property boundary
adjoining any public place, unless the wire is at a height of 2.5m or more
above ground level, or the public place is in a rural area. Internal boundary
fences are covered by the Fencing Act 1978.
>
>If the height of the fence is over 2.5m, a resource consent and a building
consent will be required. Therefore it is recommended that you contact the the
Duty Planner on 03 941 8999 if your proposed fence is over this height.
>
>####
>
>
>
>On 25/10/20 11:40 am, Henri Shustak wrote:
>> Hello,
>>
>> Thank you for the reply. I am wondering would this apply to something like
barbed wire to make getting in/out of a property more difficult? If someone
got injured by trying to get over it?
>>
>> Just had a problem with a drone overhead and then a week later (possibly
unrelated) someone in a group entering the property by climbing the fence.
Hence my questions.
>>
>> Your information has been super useful.
>>
>> Sorry to hijack this thread.
>>
>> Henri
>>
>>> On 25/10/2020, at 11:34 AM, Mark Atherton <markaren1 at xtra.co.nz> wrote:
>>>
>>> 202 Setting traps, etc
>>>
>>> (1) Every one is liable to imprisonment for a term not exceeding 5 years
who, with intent to injure, or with reckless disregard for the safety of
others, sets or places or causes to be set or placed any trap or device that
is likely to injure any person.
>>>
>>> (2) Every one is liable to imprisonment for a term not exceeding 3 years
who, being in occupation or possession of any place where any such trap or
device has been set or placed, knowingly and wilfully permits it to remain
there in such a condition that any person is likely to be injured by it.
>>>
>>> http://www.legislation.govt.nz/act/public/1961/0043/137.0/DLM329707.html
>>>
>>>
>>> On 25/10/2020 11:30 AM, Henri Shustak wrote:
>>>> Hi I am actually looking right now at what these laws are if anyone can
explain in simple terms that would be great. Basically, are you responsible
for trespassing people injuring themselves on your property? Any links would
be welcomed. I have not had any luck finding the details or even an overview.
>>>>> Damn that mantrap law.
>>>>>
>>>>> On 5/10/20 7:37 pm, Mark Atherton wrote:
>>>>>> I was about to express concern about the type of insulator that your
coffee table is constructed from (mica ?), but on second thoughts I might be
better off asking if you charge the unit before going to bed at night. Might
be good at catching burglars :)
>>>
>>>
>>> _______________________________________________
>>> Chchrobotics mailing list Chchrobotics at lists.ourshack.com
>>> https://lists.ourshack.com/mailman/listinfo/chchrobotics
>>> Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
>>> Meetings usually 3rd Monday each month. See http://kiwibots.org for venue,
directions and dates.
>>> When replying, please edit your Subject line to reflect new subjects.
>>
>>
>> _______________________________________________
>> Chchrobotics mailing list Chchrobotics at lists.ourshack.com
>> https://lists.ourshack.com/mailman/listinfo/chchrobotics
>> Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
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directions and dates.
>> When replying, please edit your Subject line to reflect new subjects.
>>
>
>
>
>------------------------------
>
>Message: 3
>Date: Sun, 25 Oct 2020 02:00:55 +0000
>From: Bevin Brett <bevin_brett at hotmail.com>
>To: "chchrobotics at lists.ourshack.com"
> <chchrobotics at lists.ourshack.com>
>Subject: [chbot] int > ascii > int
>Message-ID:
> <MW3PR12MB4491AFB7B04BA98898DD064A93180 at MW3PR12MB4491.namprd12.prod.outlook.com>
>
>Content-Type: text/plain; charset="iso-8859-1"
>
>Ok, assuming you are NOT going to use some standard library, here are the
issues and some code
>
>Let us first discuss getting the character string from one machine to the
other.
>Either (a) it is fixed length, or (b) you put a size on the beginning, or
(c) you put a flag at the end
>Fixed length is easiest, and least efficient.
>Size is only best if the length is very long - its not going to be here.
>So instead we need a flag at the end. Lets do that - we will discuss how in
a minute.
>
>So assuming that the characters arrive one at a time you get some receiver
code that looks like
>
> int i = 0;
> while (getNextChar(&c)) {
> adjust i using c
> }
>
>Next problem. What characters can you send. Can you send ANY (0x00..0xff)
character, or does the h/w and s/e connecting the two ends stop you from using
NUL (0x00)? CR? LF? Ctrl-S? Ctrl-Q? others?. Let's assume that you can
only send printable chars ' '..'~'.
>
> char firstSendableChar = ' ';
> char lastSendableChar = '~';
> int nSendableChars = ((int)(lastSendableChar) - (int)(lastSendableChar)) +
1;
>
>Now the basic idea, we are going to have to improve it, is to do this at the
transmitting end
>
> int val = <the number to send>
>
> while (val > 0) {
> char toSend = val % nSendableChars; // these two lines are the
crux of the solution
> val = val / nSendableChars;
> send((char)(toSend + firstSendableChar ))
> }
>
>
> int i = 0;
> while (getNextChar(&c)) {
> i = i*nSendableChars + (c - firstSendableChar);
> }
>
>Okay, so now we only have two problems. (a) negative numbers, and (b)
knowing when to stop.
>
>You could just do the above using unsigned int, and use
> unsigned int unsignedIntermediate = (unsigned int)(input);
> ...
> send and receive
> ...
> int output = (int) unsignedIntermediate;
>and the only problem with that is -small is a very long this way.
>
>A better approach is to send the sign bit similarly to sending the count.
>
>The second problem is that there is no positive number corresponding to the
most negative number, so you can't just do
> int sign = (value > 0);
> if (sign) value = -value;
>Instead you have to do
> if (!sign) value = -value;
>
>Now the above loop using % and / requires understanding how those operations
work with -ve numbers.
>
>How to send the sign and end-of-number bits? One thing to do place them both
in the last character. To do this,
>reduce the
>
> int nDigitChars = nSendableChars / 2;
>
>Now we can code the above loop
>
> while (val > 0) {
> int nextVal = val / nDigitChars ;
> char toSend = val % nDigitChars ; // these two lines are the crux
of the solution
> if (nextVal == 0) toSend += nDigitChars ;
> val = nextVal ;
> send((char)(toSend + firstSendableChar ))
> }
>
>and the receive loop
>
> int i = 0;
> while (getNextChar(&c)) {
> int atEnd = (c >= nDigitChars );
> if (atEnd) c -= nDigitChars ;
> i = i*nDigitChars + (c - firstSendableChar);
> if (atEnd) break;
> }
>
>I'll leave it as an exercise to the reader to place the sign bit in the last
sent character.
>
>I'm not sure the complexity of the above is worth it.
>
>Those % and / are expensive. There are faster ways than the above - I spent
a few months working on the integer to/from string in the 1990's because
believe it or not it is an important operation in telephone systems.
>
>/Bevin
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