Pagi in TSel Flash super kenceng

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Writing and reading float using Arduino EEPROM

This post is just for a personal reminder after reading discussions from elsewhere about storing and reading float values to/from EEPROM with Arduino. Scenario Writing negative float to EEPROM can be tricky, since EEPROM only recognises up to 8-bit values (see Tronixstuff  explanation ), therefore it requires an additional algorithm to make it able to store negative and float.  the scheme is to use four bits of the ATmega328's EEPROM to store numerical parts of a float value. The function involved is union . //union  value typedef union{   float flt;   byte array[4]; } FloatConverter; The code You may grab the code here
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Xeon LGA 771 di mobo LGA 775

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Bermula dari jebolnya komputer pribadi yang digunakan untuk layanan e-learning dan repositori abstrak skripsi bagi institusi tempat kami mengabdi, petualangan menyambung nyawa komputer tua dimulai. Spike  listrik adalah biang utama rusaknya perangkat ini. Ya, sebaiknya perangkat elektronik perlu pelindung dari lonjakan listrik sekedipan mata yang mematikan. Komponen yang menjadi almarhum akibat spike  kali ini adalah VGA card dan tombol reset (kok bisa, ya?).  VGA card Radeon X1300 128 MB Komputer ini sudah cukup tua usianya, sekitar 9 tahun. Motherboard-nya Intel DG31PR dengan prosesor Intel Core 2 Duo E7500 , memori DDR 2 3 GB dan harddisk SATA 500 GB 7200 RPM.  Sistem operasi yang digunakan adalah Slackware Linux  versi 13.37. Kinerja komputer ini sebagai server e-learning untuk kategori dosen jelata macam kami sudah cukup memuaskan. Sekitar 80 orang pengguna dapat dilayani secara simultan, walau bottleneck -nya tentu saja di hard-disk dan wifi seputar ruang lab. 
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NTC Thermistor Incubator Part 3: Integrating double digits 7-segment

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This is a close to final version of my triplet NTC thermistors incubator with multi-buttons on a single analog input and double digits 7 segment output.  You may read part1 and part2 , for the whole story. On a separated article, I replaced NTC thermistor and 7segment with LM35 probe and LCD 16x2,  here . Hardware setup I use  Arduino standalone on breadboard , common anode double digits 7 segment  16 pins, two 74HC595 s, three NTC thermistor s, an FTDI 5v uploader ,  an optocoupler protected relay module , resistors (10kΩ, 1kΩ, 4k7Ω, 470Ω, 220Ω and 47Ω), and push buttons. Since the 7 segment that I purchased has no datasheet, it is important to look at other version of common anode (tandyonline.co.uk): The final setup on breadboard: The codes You may grab the codes here What next? Obviously, the next step is to print a PCB ( there is a great tutorial  on the Tube, or if you understand Bahasa Indonesia, here is a great tutorial from Duwi ) for this project and to
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