万用表接电源正极和VCC，然后单片机的稳压输入或者VCC不要直接连电源
sleep mode下减小电流有几种方法，去看数据手册
其中一条是接口不要接阻性负载，并尽量给一个确定的电位，不要接近VCC/2，会很耗电流
ATmega16A Datasheet: When entering a sleep mode, all port pins should be configured to use minimum power. The most important thing is then to ensure that no pins drive resistive loads. In sleep modes where the both the I/O clock (clkI/O) and the ADC clock (clkADC) are stopped, the input buffers of the device will be disabled. This ensures that no power is consumed by the input logic when not needed. In some cases, the input logic is needed for detecting wake-up conditions, and it will then be enabled. Refer to the section “Digital Input Enable and Sleep Modes” on page 53 for details on which pins are enabled. If the input buffer is enabled and the input signal is left floating or have an analog signal level close to VCC/2, the input buffer will use excessive power.
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