毫歐表簡化版大字體 Nano + LM317
可以用的, 抄襲商品的閹割版沒開源. 實驗板雛型的舊照片和電路圖, 自帶顯示, 不需要用數字萬用表配合.零件 arduino Nano, LM317, 10 ohm 電阻, LCD1602, 電池4V~5V
燒錄劇本, 使用 usbtiny
@echo off
::set mcu=ATMEGA8
::set mcu=ATMEGA168P
set mcu=ATMEGA328P
::mega328 16MHz Xtal. i.e. arduino nano/uno
set lfuse=0xff
set hfuse=0xda
set efuse=0x05
:::: commercial delay 1 sec
::set main=miniOhm_metre_largefont_ver2_001_m328_boot.hex
::set main=miniOhm_metre_largefont_ver2_001_m328.hex
:::: demo, update interval 51 sec
::set main=miniOhm_metre_largefont_ver2_051_m328_boot.hex
::set main=miniOhm_metre_largefont_ver2_051_m328.hex
:::: experiental update, interval 3 sec
set main=miniOhm_metre_largefont_ver2_003sec_m328_115200_16MHz.hex
set ac=C:\WinAVR-20100110
path %ac%\bin;%ac%\utils\bin;%path%;
@echo on
avrdude -c usbtiny -p %mcu% -U flash:w:"%main%":a -U lfuse:w:%lfuse%:m-U hfuse:w:%hfuse%:m
pause
燒錄文件
miniOhm_metre_largefont_ver2_003sec_m328_115200_16MHz.hex
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pdshyh 发表于 2024-5-29 09:55
谢谢，lm317这么多玩法，数据手册给出了恒流充电和恒压充电电路，刚刚下单买了一个定流充电模块，
...
请你给出你的全部电路及各元件的参数，否则不好分析。
5V的供电电压，317的压差一般要求3V，恒流取样电阻压差1.25V，剩余的恒流输出端电压仅限于0.75V及其以下。如果你的负载电阻较大，则将严重影响317的工作状态，不能恒流输出那就可以理解了。 请问单片机用的是什么型号？ 本帖最后由 美人鱼999 于 2024-5-19 15:03 编辑
有点好耍 发表于 2024-5-19 14:15
请问单片机用的是什么型号？
miniOhm_metre_largefont_ver2_003sec_m328_115200_16MHz.hex
M328
mcu=ATMEGA328P 有点好耍 发表于 2024-5-19 14:15
请问单片机用的是什么型号？
10元錢的 mega8/ mega168 或者 mega328 小板都可
收下了，谢谢。有空搞搞。。 有空就试一试，学习学习！ 厉害，单片机玩得溜 本帖最后由 pdshyh 于 2024-5-28 16:08 编辑
手头都有现成的元器件，原理图lm317部分与它的的可调稳压电路比，lm317连接2脚为什么没有接地？ pdshyh 发表于 2024-5-28 16:00
手头都有现成的元器件，原理图lm317部分与它的的可调稳压电路比，lm317连接2脚为什么没有接地？
LM317 100mA恆流可參考標準的数据手册有給出範例 xiaolaba 发表于 2024-5-28 22:39
LM317 100mA恆流可參考標準的数据手册有給出範例
谢谢，lm317这么多玩法，数据手册给出了恒流充电和恒压充电电路，刚刚下单买了一个定流充电模块，:L
两个电路稍微有些差别，手册接法12Ω恒流100ma，看电路图可以做成四线测量的吧，确实是非常简单的毫欧表，不知道精度怎么样。:handshake
补充内容 (2024-5-29 16:43):
买到假LM317了，5V供电R1=10Ω输出电流随输出阻值变化而变化11ma～19ma，提高供电电压输出电流也随之增大到100多ma，R1=20Ω,输入电压5-12V，输出电流19ma～60ma。 本帖最后由 xiaolaba 于 2024-5-31 09:11 编辑
pdshyh 发表于 2024-5-29 09:55
谢谢，lm317这么多玩法，数据手册给出了恒流充电和恒压充电电路，刚刚下单买了一个定流充电模块，
...
可能接線不對.實驗筆記你可參考看看
wanwenhao1 发表于 2024-5-31 08:32
请你给出你的全部电路及各元件的参数，否则不好分析。
5V的供电电压，317的压差一般要求3V，恒流取样电 ...
感谢wanwenhao1老师的关心，楼下xiaolaba楼主老师说的对，我看楼主的第一张原理图没注意接线不对，还以为买的芯片有问题，现在在外面过两天回去再搭线路实验。 xiaolaba 发表于 2024-5-31 09:09
可能接線不對.實驗筆記你可參考看看
感谢xiaolaba 老师指点，提供了一个工整严谨的实验笔记样板，惭愧我是随便找张废纸记录也电子存档，时间长了就可能遗失了当时实验细节。看您第一张原理图没注意自己接线不对，还以为买的芯片有问题，现在在外面过两天回去再搭线路实验。
修改错误，加散热片气温稍微有点高开关电源供电电流有些下滑的多短时间跌落近1ma，换电池供电短时间跌落0.1ma。
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