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Recent content by Ahmad Edi Saputra

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    [SOLVED] MAX232 heat up after a few month

    i know it is a bad solution. but i can't came up with any other solution. for the first time, i think is only because floating condition on TX input max232 so it might caused high frequency noise, i added pull up, doesn't solve the problem, then i add series resistance with DB9, sometime still...
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    NPK sensor for microcontrollers

    yes, i think there is some journal i've read that use conductivity methode to determine NPK value, i just don't have the related data. i'll do more research, may be i'll post in this thread if i found out nice info, i also confuse why there is a cheap device like...
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    [SOLVED] MAX232 heat up after a few month

    i found some good reference, add 330ohm resistor to vcc pin and supply voltage, pull up every TX pin. and in max232 out and in. add 330 resistor before DB9 connector. it works, and i dont know why, now i am not having much problem like before thanks all
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    NPK sensor for microcontrollers

    hello every one i just wondering is there any NPK module out there that i can integrate with microcontroller? doesn't has to be exactly accurate, at least can tell is the soil contains good enough NPK substance. i read a few article, including using light reflection with photodiode, haven't...
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    [SOLVED] MAX232 heat up after a few month

    Hi, i don't see any discussion in this forum, or i missed something perhaps, i already read some advise to pull up floating tx, and i did, but i get same result, even i add some 330 from v+ supply to max232 vcc, still no luck. dirty power suply, i am not quite sure, i just use USB VCC, but...
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    [SOLVED] MAX232 heat up after a few month

    Hello, i am currently use max232CSE and ch340 to drive a thermal printer for my application. i do some test to my final board, about 10000 transaction a day, it work properly without error. but when i use it in outdoor (water is not the case) after 1 or 2 month it heats up and burn sometimes...
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    USB connection, usb speed and connector bandwith

    i tried to use usb hub, but no luck. where can i edit usb descriptor? because i can change the usb device firmware
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    USB connection, usb speed and connector bandwith

    Thanks FvM, you are right, what i mean with "lower speed" is usb FS. is there any way i modify electrically or programatically (bios may be) the connection so it will be forced to FS USB?
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    USB connection, usb speed and connector bandwith

    i make custome usb connection using speakon connector and 3meter usb cable for some reason. when i use it in lower speed, like arduino for example, it work fine. but when i tried to connect it to my device(higher speed) it gave me same error status. is this bacause speakon bandwidth? because if...
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    [SOLVED] [ASK] jumps to a specific address in STM32 Cortex-M3

    Re: [ASK] jump to specific address in STM32 Cortex-M3 i think i just figured that out. its definitely linker problem, i change rom base address in the linker option. thanks, i'll mark as resolved
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    [SOLVED] [ASK] jumps to a specific address in STM32 Cortex-M3

    Re: [ASK] jump to specific address in STM32 Cortex-M3 i tried to dig deeper, i break down the different hex from STM32f103 and STMF407, bellow is the hex i break down base on intel hex format. i found very interesting fact, that changes of ROM address in keil make no effect for stm32f103...
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    [SOLVED] [ASK] jumps to a specific address in STM32 Cortex-M3

    Re: [ASK] jump to specific address in STM32 Cortex-M3 Thanks for your answer i've tried, but it jump to the next instruction. here is what i meant if (((*(__IO uint32_t*)APPLICATION_ADDRESS) & 0x2FFE0000 ) == 0x20000000){ NVIC_SetVectorTable(NVIC_VectTab_FLASH, APPLICATION_ADDRESS)...
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    [SOLVED] [ASK] jumps to a specific address in STM32 Cortex-M3

    [ASK] jump to specific address in STM32 Cortex-M3 Hi i am currently using stm32f103C8, i want to build a custom bootloader in address 0x8000000 and my application will placed in 0x8008000. in cortex M4 (stm32f407vgtx) i manage to jump to address 0x8008000 with these code if (((*(__IO...
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    Disable Reset while installing driver USB Serial COM

    Dear All i need help with these 2 case 1. Can I disable modem reset (DTR pulse) while installing driver usb to serial port? so when i plug usb to serial, pin DTR will always remain low (or high), default instaling usb serial while generate about 3 or 4 pulse on pin DTR. 2. Can I detect usb...
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    [ARM] STM Flash Loader Demonstration

    hi, i am working on stm32f4 and know i try to flash my stm32f4 with uart, but i dont understand about erase command that i found on document number CD00264342, it says data frame command should use two byte addressing as page number to be erased, thanks for any help
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