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	▲	godelski 2 hours ago
		`> 16 cents Cheapest photodiode on digikey` On DigiKey the cheapest is $0.125[0]. On Alibaba I can find much cheaper, including less than penny [1,2]. Now pretend with me that you're building in lots. You're going to get cheaper than Alibaba, though maybe not by much. `> I do board level designs and drop down LEDs. If you are not specialising in indicators, its hard to visualise how bright 10mA through your diode is going to be.` I think if it is annoying enough that at presumably >10m away it can keep the gp awake you don't really need to be that precise in your measurement. It's basically way too bright. But if you want to get creative you could use the diodes in the circuit or even your led if you'll blink it. But that last one doesn't tell you the led brightness, only ambient. [0] https://www.digikey.com/en/products/detail/harvatek-corporat... [1] https://www.alibaba.com/product-detail/1-4V-20-30-45-60_6253... [2] https://www.alibaba.com/product-detail/JST3-3MM-receiver-pho...