diff --git a/application.c b/application.c
index 5e0add9..4fff7ce 100644
--- a/application.c
+++ b/application.c
@@ -54,6 +54,8 @@ static uint32_t boot_time = 0;
 #define TARGET_CHANNEL 1 /**< PA1/ADC1_IN1 used to measure target voltage */
 const uint8_t adc_channels[] = {ADC_CHANNEL17, ADC_CHANNEL(TARGET_CHANNEL)}; /**< voltages to convert (channel 17 = internal voltage reference) */
 #define TARGET_EN PA5 /**< pin to provide target voltage to LV side of voltage shifter (pulling them high through 10 kO) */
+#define TARGET_5V PA7 /**< pin to provide 5 V on target voltage (controlling gate of pMOS, externally pulled up) */
+#define TARGET_3V PB0 /**< pin to provide 3.3 V on target voltage (controlling gate of pMOS, externally pulled up) */
 
 #define CHANNEL_NUMBERS 16 /**< number of target signals */
 static const uint32_t channel_ports[] = {GPIO_PORT(PB12), GPIO_PORT(PB13), GPIO_PORT(PB14), GPIO_PORT(PB15), GPIO_PORT(PA8), GPIO_PORT(PA9), GPIO_PORT(PA10), GPIO_PORT(PA15), GPIO_PORT(PB3), GPIO_PORT(PB4), GPIO_PORT(PB5), GPIO_PORT(PB6), GPIO_PORT(PB7), GPIO_PORT(PB8), GPIO_PORT(PB9), GPIO_PORT(PB10)}; /**< GPIO ports for signal pin */
@@ -173,20 +175,51 @@ static void print_idcode(uint32_t idcode)
 // menu commands
 
 /** measure and print target voltage
- *  @param[in] argument not used
+ *  @param[in] argument 0 to no provide power, 3 to provide 3.3V, 5 to provide 5V
  */
 static void command_target_voltage(void* argument)
 {
 	(void)argument; // we won't use the argument
 
 	gpio_set(GPIO_PORT(TARGET_EN), GPIO_PIN(TARGET_EN)); // ensure the level shifters pulling up the signals are not enabled
+
+	// set voltage
+	if (argument) { // if argument is provided
+		const uint8_t voltage = *(uint32_t*)argument; // get target voltage
+		switch (voltage) {
+		case 0:
+			gpio_set(GPIO_PORT(TARGET_5V), GPIO_PIN(TARGET_5V)); // disable 5V output
+			gpio_set(GPIO_PORT(TARGET_3V), GPIO_PIN(TARGET_3V)); // disable 3V output
+			break;
+		case 3:
+			gpio_set(GPIO_PORT(TARGET_5V), GPIO_PIN(TARGET_5V)); // disable 5V output
+			gpio_clear(GPIO_PORT(TARGET_3V), GPIO_PIN(TARGET_3V)); // enable 3V output
+			break;
+		case 5:
+			gpio_clear(GPIO_PORT(TARGET_5V), GPIO_PIN(TARGET_5V)); // enable 5V output
+			gpio_set(GPIO_PORT(TARGET_3V), GPIO_PIN(TARGET_3V)); // disable 3V output
+			break;
+		default:
+			puts("unknown voltage to set\n");
+			break;
+		}
+		sleep_us(100); // wait a bit for voltage to settle
+	}
+
+	// show voltage output
+	if (!gpio_get(GPIO_PORT(TARGET_5V), GPIO_PIN(TARGET_5V))) {
+		puts("target voltage set to 5 V\n");
+	} else if (!gpio_get(GPIO_PORT(TARGET_3V), GPIO_PIN(TARGET_3V))) {
+		puts("target voltage set to 3.3 V\n");
+	} else {
+		puts("target voltage externally provided\n");
+	}
+
 	float* voltages = measure_voltages(); // measure voltages
 	puts("target voltage: ");
 	print_fpu(voltages[1], 2);
 	puts(" V");
-	if (voltages[1] > 3.25) {
-		puts(" (warning: signal voltage may exceed 3.30 V limit)");
-	} else if (voltages[1] < 1.0) {
+	if (voltages[1] < 1.0) {
 		puts(" (warning: target voltage seems not connected)");
 	}
 	putc('\n');
@@ -683,9 +716,9 @@ static const struct menu_command_t menu_commands[] = {
 	{
 		.shortcut = 'v',
 		.name = "voltage",
-		.command_description = "measure target voltage",
-		.argument = MENU_ARGUMENT_NONE,
-		.argument_description = NULL,
+		.command_description = "set/measure target voltage",
+		.argument = MENU_ARGUMENT_UNSIGNED,
+		.argument_description = "[0|3|5]",
 		.command_handler = &command_target_voltage,
 	},
 	{
@@ -842,6 +875,14 @@ void main(void)
 	gpio_set(GPIO_PORT(TARGET_EN), GPIO_PIN(TARGET_EN)); // ensure we do not enable pMOS to power level shifters
 	gpio_set_output_options(GPIO_PORT(TARGET_EN), GPIO_OTYPE_OD, GPIO_OSPEED_2MHZ, GPIO_PIN(TARGET_EN)); // set output as open-drain
 	gpio_mode_setup(GPIO_PORT(TARGET_EN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(TARGET_EN)); // configure pin as output
+	rcc_periph_clock_enable(GPIO_RCC(TARGET_3V)); // enable clock for port domain
+	gpio_set(GPIO_PORT(TARGET_3V), GPIO_PIN(TARGET_3V)); // ensure we do not enable pMOS to provide voltage
+	gpio_set_output_options(GPIO_PORT(TARGET_3V), GPIO_OTYPE_OD, GPIO_OSPEED_2MHZ, GPIO_PIN(TARGET_3V)); // set output as open-drain
+	gpio_mode_setup(GPIO_PORT(TARGET_3V), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(TARGET_3V)); // configure pin as output
+	rcc_periph_clock_enable(GPIO_RCC(TARGET_5V)); // enable clock for port domain
+	gpio_set(GPIO_PORT(TARGET_5V), GPIO_PIN(TARGET_5V)); // ensure we do not enable pMOS to provide voltage
+	gpio_set_output_options(GPIO_PORT(TARGET_5V), GPIO_OTYPE_OD, GPIO_OSPEED_2MHZ, GPIO_PIN(TARGET_5V)); // set output as open-drain
+	gpio_mode_setup(GPIO_PORT(TARGET_5V), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(TARGET_5V)); // configure pin as output
 	puts("OK\n");
 
 	puts("setup signal pins: ");