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  • Thomas1953 commented on amandaghassaei's instructable Arduino Waveform Generator6 months ago
    Arduino Waveform Generator

    Text in step 10 says . . . . use 300 Ohm for low pass filter, but the image shows 10k resistance

    Text in step 8 is not confirmed by the image, brown/black/orange is 10k and not 20k

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  • Arduino ATtiny2313 Programming Shield

    DearVishalapr,Ihave two remarks . . .1-Onthe protoboard drawing Arduinopin 10 is connected with 2313-pin 2,this must be 1.2-Imade several shield for the Attiny family (84/85 and 2313) out ofprotoboard but they never fit nicely. Reason is that theArduino 13 to 8 connections are not exactly opposite the Rst to Gndconnections.Attached you can see my solution . . . I also useda RGB led on 7-8-9 to follow the uploading process.Regards, Tom

    JPG doesn't seem to improve the image, still square, sorry

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  • Arduino ATtiny85 Programmer Shield on PCB [ATtinyShield]

    Sorry to say, but . . . there is a fault of 1,27mm in your design.The connections on a Arduino Uno are NOT exactly opposite of one another.In your design 3.3V is exactly opposite of 10 and 5V is opposite of 9.This is not the case on the Arduino Uno. The "level" of 5V is "between" 9 and 10, and 3,3V is "between" 10 and 11 (and so on). In my PCB design I moved connections 13 to 9 down 1,27 mm.It fits much better now, regards Tom

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  • Arduino ATtiny85 Programmer Shield on PCB [ATtinyShield]

    Nice project, but . . . . the rar file is password protected !Can you help me out ?regards, Tom

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  • Thomas1953 commented on JON-A-TRON's instructable Off Grid Power Supply1 year ago
    Off Grid Power Supply

    (second reply . . firstone apparently got lost)Please read . . . . https://www.baintech.com.au/what-is-the-difference-between-a-pure-sine-and-modified-sine-inverterAll the little differencesbetween modified sine wave and pure sine wave will generate a lot of heat.ResuméCompared with the 35 Ah battery . . .The inverteris far too large, 150~200W is more than enoughPlease considerpure Sine Wave inverter like VICTRONENERGY or MASTERVOLTThe charger isfar too small, 12V 6~8 Amps is better

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  • Thomas1953 commented on JON-A-TRON's instructable Off Grid Power Supply1 year ago
    Off Grid Power Supply

    Please read . . .https://www.baintech.com.au/what-is-the-difference...All the differences between modified and pure sine wave will generate (a lot of) heat. Pure SineWave Power is produced by inverters from VICTRONENERGY or MASTERVOLT and remember 200W will do

    I made a few calculations . . . .If you appreciate maximum lifetime (= number of discharge/chargecycles) from your battery then it should not be discharged more than 60%. This means that this 35Ah battery will not give you more than 20Ahcapacity. Which means 12V times 20Ah is 240Wh.You may be happy with that but . . . discharging and invertingto AC will both generate some heat, again a 10% loss at least.Finally you will end up with not much more then 200Wh.The charger can deliver 12V times 1,25A minus 15% heat loss is13 W. Charging 200Wh will take approx. 16 hours !What I do not understand is the 800W inverter . . . Continues discharge of a battery in Amps should (rule of thumb) not exceed 25%of the capacity figure. In this case 25% of 35 is a maximum discharge of 8-9 Amps, times 12V i...

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    I made a few calculations . . . .If you appreciate maximum lifetime (= number of discharge/chargecycles) from your battery then it should not be discharged more than 60%. This means that this 35Ah battery will not give you more than 20Ahcapacity. Which means 12V times 20Ah is 240Wh.You may be happy with that but . . . discharging and invertingto AC will both generate some heat, again a 10% loss at least.Finally you will end up with not much more then 200Wh.The charger can deliver 12V times 1,25A minus 15% heat loss is13 W. Charging 200Wh will take approx. 16 hours !What I do not understand is the 800W inverter . . . Continues discharge of a battery in Amps should (rule of thumb) not exceed 25%of the capacity figure. In this case 25% of 35 is a maximum discharge of 8-9 Amps, times 12V is 100W !A 150 to 200W inverter is much better in proportion with the 35AHbattery.Maybe the most important question is . . . . what is the shapeof the AC coming out of that inverter. As it is NOT mentioned in itsspecifications then you will have a nine out of ten chance that it is NOT aSINE-wave. Anything else but a Sine wave will produce a lot of heat and finally ruin anyadapter.For safety reasons in this mobile construction I would buy a AGM type battery. AGM stands for Absorbed in Glass Mats, so the acid electrolyte is captured in aglass mat.I have seen a pallet full of these batteries that fell from a lorry. They wereobviously broken but there wasn’t spilled one drop of acid.I must say I like the design of the cabinet !regards, Tom.

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  • Thomas1953 followed m1 year ago
  • Thomas1953 commented on samuel123abc's instructable Nokia 5110 Graphics Tutorial1 year ago
    Nokia 5110 Graphics Tutorial

    Unzipping the LCDAssistant file . . . . makes my virus scanner very nervous

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  • Quick Start to Nodemcu (ESP8266) on Arduino IDE

    Dear Magesh,I do not see any video . . . did you remove them ??Tom

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  • Weather Station With Arduino/Genuino , ESP8266, BMP180, DHT22 and Thingspeak

    Yes and Yes . . .I noticed that ESP8266's baudrate is 115200. In you ino-file you are using 9600 . . . can that be the problem ?regards, Tom

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  • Weather Station With Arduino/Genuino , ESP8266, BMP180, DHT22 and Thingspeak

    Again . . . the station works fine, but there is only data visible in my SerialMonitor but NOT on Thingspeak. I think it has to do with the settings of the BaudRate but I am to unfamiliar with this technique to get it right. Can you help me out, regards Tom.

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  • Weather Station With Arduino/Genuino , ESP8266, BMP180, DHT22 and Thingspeak

    Dear Tittiamo,I receive in my Serial Monitor message "AT+CIPCLOSE" after every Temp, Hum and Pressure reading. This means (I think) that the data is NOT uploaded to thingspeak (I see no data there). Can you help me out ?regards, Tom

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  • Thomas1953 followed Arduino channel 2 years ago